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.

1 files changed, 6 insertions, 0 deletions

diff --git a/cfg.mk b/cfg.mk
index 77e04877..3cfb1cce 100644
--- a/cfg.mk
+++ b/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$$
+exclude_file_name_regexp--sc_two_space_separator_in_usage = \
+  ^build-aux/gnupload$$