Fortran support tag.
(AC_LIBTOOL_PROG_CC_C_O, _LT_AC_TAGCONFIG): Support F77 tag.
(AC_LIBTOOL_F77, _LT_AC_LANG_F77, AC_LIBTOOL_LANG_F77_CONFIG):
New macros for F77 tag Fortran support.
* configure.ac: Add support for creating the new F77 tag.
* bootstrap: Add f77demo directory to the list to be processed.
* Makefile.am: Add support for FFLAGS and FLIBS.
* tests/Makefile.am: Add new Fortran tests.
* tests/f77demo-*.test: New files.
* f77demo/configure.ac, f77demo/cprogram.c, f77demo/fooc.c
* f77demo/foof.f, f77demo/foo.h, f77demo/fprogram.f
* f77demo/Makefile.am, f77demo/README: New files.
