maint: convert .x-sc_* into exclude_file_name_regexp--sc_* exemptions

Many of the .x-sc_* exemptions were no long necessary.  Remove those
files and instead, provide exemptions via variable definitions in
cfg.mk to address the few remaining exceptions.
* .x-sc_prohibit_atoi_atof: Remove file.
* .x-sc_space_tab: Likewise.
* .x-sc_sun_os_names: Likewise.
* .x-sc_trailing_blank: Likewise.
* .x-sc_two_space_separator_in_usage: Likewise.
* .x-sc_useless_cpp_parens: Likewise.
* cfg.mk: Add minimal exemptions.
* cfg.mk: Add minimal exemptions.
* doc/standards.texi (Standard C): Address the sole useless-cpp-parens
violation in this file:
-#if defined (__STDC__) || defined (WINDOWSNT)
+#if defined __STDC__ || defined WINDOWSNT
With that, the only remaining offender is config.guess, whose name
is now listed in cfg.mk.
Suggested by Eric Blake.

.x-sc_prohibit_atoi_atof

@@ -1,3 +0,0 @@
-ChangeLog
-maint.mk
-doc/autoconf.texi

.x-sc_space_tab

@@ -1,4 +0,0 @@
-build-aux/config.guess
-build-aux/config.sub
-aclocal.m4
-configure

.x-sc_sun_os_names

@@ -1 +0,0 @@
-build-aux/config.guess

.x-sc_trailing_blank

@@ -1,5 +0,0 @@
-build-aux/gendocs.sh
-build-aux/texinfo.tex
-doc/gendocs_template
-doc/gnu-oids.texi
-doc/standards.texi

.x-sc_two_space_separator_in_usage

@@ -1 +0,0 @@
-gnupload

.x-sc_useless_cpp_parens

@@ -1,2 +0,0 @@
-build-aux/config.guess
-doc/standards.texi

cfg.mk

@@ -133,3 +133,9 @@ old_NEWS_hash = 33207c359dd7db17cc0cd151da6b9567
 exclude_file_name_regexp--sc_prohibit_undesirable_word_seq = ^maint\.mk$$
 exclude_file_name_regexp--sc_prohibit_test_minus_ao = \
   ^(maint\.mk|doc/autoconf\.texi)$$
+
+exclude_file_name_regexp--sc_prohibit_atoi_atof = ^doc/autoconf\.texi$$
+exclude_file_name_regexp--sc_useless_cpp_parens = ^build-aux/config\.guess$$
+exclude_file_name_regexp--sc_trailing_blank = ^build-aux/texinfo\.tex$$
+exclude_file_name_regexp--sc_two_space_separator_in_usage = \
+  ^build-aux/gnupload$$

doc/standards.texi

@@ -3,7 +3,7 @@
 @setfilename standards.info
 @settitle GNU Coding Standards
 @c This date is automagically updated when you save this file:
-@set lastupdate January 8, 2012
+@set lastupdate January 21, 2012
 @c %**end of header
 
 @dircategory GNU organization
@@ -472,7 +472,7 @@ prototypes, you may want to use a preprocessor macro like this:
 
 @example
 /* Declare the prototype for a general external function.  */
-#if defined (__STDC__) || defined (WINDOWSNT)
+#if defined __STDC__ || defined WINDOWSNT
 #define P_(proto) proto
 #else
 #define P_(proto) ()