syntax-check: fix violations and re-enable sc_prohibit_empty_lines_at_EOF.

syntax-check: fix violations and re-enable sc_prohibit_empty_lines_at_EOF.

* cfg.mk (local-checks-to-fix): Remove
sc_prohibit_empty_lines_at_EOF from list of disabled checks.
* THANKS, libltdl/argz.c, libltdl/config/getopt.m4sh,
tests/f77demo/README, tests/f77demo/cprogram.c,
tests/f77demo/fprogram.f, tests/fcdemo/README,
tests/fcdemo/cprogram.c, tests/libtoolize.at,
tests/mdemo/README, tests/mdemo2/README, tests/pdemo-inst.test:
Remove spurious empty lines from the end of these files.

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