syntax-check: fix violations and implement sc_trailing_blank-non-rfc3676.

* cfg.mk (local-checks-to-fix): Move sc_trailing_blank from
here...
(local-checks-to-skip): ...to here, because otherwise it flags
valid RFC3676 signature blocks.
(sc_trailing_blank-non-rfc3676): An improved sc_trailing_blank
implementation that doesn't flag signature blocks as violations.
* Makefile.am, bootstrap.conf, doc/PLATFORMS,
libltdl/config/ltmain.m4sh, libltdl/m4/libtool.m4,
libltdl/m4/lt~obsolete.m4, tests/archive-in-archive.at,
tests/convenience.at, tests/darwin.at, tests/depdemo/l1/l1.c,
tests/depdemo/l2/l2.c, tests/depdemo/l3/l3.c,
tests/depdemo/l4/l4.c, tests/f77demo/README,
tests/f77demo/cprogram.c, tests/f77demo/foof.f,
tests/f77demo/foof2.f, tests/f77demo/foof3.f,
tests/f77demo/fprogram.f, tests/fcdemo/README,
tests/fcdemo/cprogram.c, tests/fcdemo/foof.f90,
tests/fcdemo/foof2.f90, tests/fcdemo/foof3.f90,
tests/fcdemo/fprogram.f90, tests/mdemo/README,
tests/mdemo/main.c, tests/mdemo/mlib.c, tests/objectlist.test,
tests/static.at, tests/template.at, tests/testsuite.at: Remove
trailing blanks.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>

cfg.mk

@@ -41,8 +41,7 @@ local-checks-to-fix =				\
 	sc_prohibit_always-defined_macros	\
 	sc_prohibit_always_true_header_tests	\
 	sc_require_config_h			\
-	sc_require_config_h_first		\
-	sc_trailing_blank
+	sc_require_config_h_first
 
 local-checks-to-skip =				\
 	$(local-checks-to-fix)			\
@@ -50,6 +49,7 @@ local-checks-to-skip =				\
 	sc_bindtextdomain			\
 	sc_cast_of_x_alloc_return_value		\
 	sc_program_name				\
+	sc_trailing_blank			\
 	sc_unmarked_diagnostics
 
 # GPL_version: checks for GPLv3, which we don't use
@@ -57,8 +57,14 @@ local-checks-to-skip =				\
 # cast_of_x_alloc_return_value:
 #         We support C++ compilation which does require casting here.
 # program_name: libtool has no programs!
+# trailing_blank: flags valid rfc3676 separators
 # unmarked_diagnostics: libtool isn't internationalized
 
+sc_trailing_blank-non-rfc3676:
+	@prohibit='([^-][^-][	 ][	 ]*|^[	 ][	 ]*)$$'		\
+	halt='found trailing blank(s)'					\
+	  $(_sc_search_regexp)
+
 # List syntax-check exempted files.
 exclude_file_name_regexp--sc_error_message_uppercase = \
   ^$(_build-aux)/cvsu$$
@@ -67,3 +73,4 @@ exclude_file_name_regexp--sc_prohibit_strcmp = \
 exclude_file_name_regexp--sc_prohibit_test_minus_ao = \
   ^m4/libtool.m4$$
 exclude_file_name_regexp--sc_space_tab = \.diff$$
+exclude_file_name_regexp--sc_trailing_blank-non-rfc3676 = \.diff$$

tests/f77demo/foof.f

@@ -1,9 +1,7 @@
-C 
 C This program is free software; you can redistribute it and/or
 C modify it under the terms of the GNU General Public License
 C as published by the Free Software Foundation; either version 2
 C of the License, or (at your option) any later version.
-C 
 
       subroutine fsub(arg,res)
       write(*,*) 'fsub called'

tests/f77demo/foof2.f

@@ -1,9 +1,7 @@
-C 
 C This program is free software; you can redistribute it and/or
 C modify it under the terms of the GNU General Public License
 C as published by the Free Software Foundation; either version 2
 C of the License, or (at your option) any later version.
-C 
 
       subroutine fsubf(arg,res)
       implicit none

tests/f77demo/foof3.f

@@ -1,9 +1,7 @@
-C 
 C This program is free software; you can redistribute it and/or
 C modify it under the terms of the GNU General Public License
 C as published by the Free Software Foundation; either version 2
 C of the License, or (at your option) any later version.
-C 
 
       subroutine fsub3(arg,res)
       implicit none

tests/f77demo/fprogram.f

@@ -1,9 +1,7 @@
-C 
 C This program is free software; you can redistribute it and/or
 C modify it under the terms of the GNU General Public License
 C as published by the Free Software Foundation; either version 2
 C of the License, or (at your option) any later version.
-C 
 
       program fprogram
       implicit none

tests/fcdemo/foof.f90

@@ -1,9 +1,8 @@
-! 
 ! This program is free software; you can redistribute it and/or
 ! modify it under the terms of the GNU General Public License
 ! as published by the Free Software Foundation; either version 2
 ! of the License, or (at your option) any later version.
-! 
+
 subroutine fsub(arg,res)
   write(*,*) 'fsub called'
   call fsubf(arg,res)

tests/fcdemo/foof2.f90

@@ -1,9 +1,8 @@
-! 
 ! This program is free software; you can redistribute it and/or
 ! modify it under the terms of the GNU General Public License
 ! as published by the Free Software Foundation; either version 2
 ! of the License, or (at your option) any later version.
-! 
+
 subroutine fsubf(arg,res)
   implicit none
   integer arg,res

tests/fcdemo/foof3.f90

@@ -1,9 +1,8 @@
-! 
 ! This program is free software; you can redistribute it and/or
 ! modify it under the terms of the GNU General Public License
 ! as published by the Free Software Foundation; either version 2
 ! of the License, or (at your option) any later version.
-! 
+
 subroutine fsub3(arg,res)
   implicit none
   integer arg,res

tests/fcdemo/fprogram.f90

@@ -1,9 +1,8 @@
-! 
 ! This program is free software; you can redistribute it and/or
 ! modify it under the terms of the GNU General Public License
 ! as published by the Free Software Foundation; either version 2
 ! of the License, or (at your option) any later version.
-! 
+
 program fprogram
   implicit none
   integer arg,res