Add Gnulib maintainer modules.

* m4/gnulib-cache.m4: Add `announce-gen', `gendocs', `gitlog-to-changelog',
  `gnupload', `gnu-web-doc-update', and `maintainer-makefile'.

* .gnuploadrc, .x-sc_GPL_version, .x-sc_avoid_if_before_free,
  .x-sc_error_message_period, .x-sc_cast_of_alloca_return_value,
  .x-sc_cast_of_argument_to_free, .x-sc_error_message_uppercase,
  .x-sc_error_message_warn_fatal: New files.

lib/Makefile.am

@@ -9,7 +9,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl=3 --libtool --macro-prefix=gl --no-vc-files alignof alloca-opt autobuild byteswap canonicalize-lgpl environ extensions flock fpieee full-read full-write havelib iconv_open-utf inet_ntop inet_pton lib-symbol-versions lib-symbol-visibility libunistring putenv stdlib strcase strftime striconveh string verify version-etc-fsf vsnprintf warnings
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl=3 --libtool --macro-prefix=gl --no-vc-files alignof alloca-opt announce-gen autobuild byteswap canonicalize-lgpl environ extensions flock fpieee full-read full-write gendocs gitlog-to-changelog gnu-web-doc-update gnupload havelib iconv_open-utf inet_ntop inet_pton lib-symbol-versions lib-symbol-visibility libunistring maintainer-makefile putenv stdlib strcase strftime striconveh string verify version-etc-fsf vsnprintf warnings
 
 AUTOMAKE_OPTIONS = 1.5 gnits subdir-objects
 
@@ -62,6 +62,13 @@ EXTRA_DIST += alloca.in.h
 
 ## end   gnulib module alloca-opt
 
+## begin gnulib module announce-gen
+
+
+EXTRA_DIST += $(top_srcdir)/build-aux/announce-gen
+
+## end   gnulib module announce-gen
+
 ## begin gnulib module arpa_inet
 
 BUILT_SOURCES += $(ARPA_INET_H)
@@ -267,12 +274,50 @@ libgnu_la_SOURCES += full-write.h full-write.c
 
 ## end   gnulib module full-write
 
+## begin gnulib module gendocs
+
+
+EXTRA_DIST += $(top_srcdir)/build-aux/gendocs.sh
+
+## end   gnulib module gendocs
+
 ## begin gnulib module gettext-h
 
 libgnu_la_SOURCES += gettext.h
 
 ## end   gnulib module gettext-h
 
+## begin gnulib module gitlog-to-changelog
+
+
+EXTRA_DIST += $(top_srcdir)/build-aux/gitlog-to-changelog
+
+## end   gnulib module gitlog-to-changelog
+
+## begin gnulib module gnu-web-doc-update
+
+
+EXTRA_DIST += $(top_srcdir)/build-aux/gnu-web-doc-update
+
+## end   gnulib module gnu-web-doc-update
+
+## begin gnulib module gnumakefile
+
+distclean-local: clean-GNUmakefile
+clean-GNUmakefile:
+	test x'$(VPATH)' != x && rm -f $(top_builddir)/GNUmakefile || :
+
+EXTRA_DIST += $(top_srcdir)/GNUmakefile
+
+## end   gnulib module gnumakefile
+
+## begin gnulib module gnupload
+
+
+EXTRA_DIST += $(top_srcdir)/build-aux/gnupload
+
+## end   gnulib module gnupload
+
 ## begin gnulib module gperf
 
 GPERF = gperf
@@ -461,6 +506,12 @@ EXTRA_libgnu_la_SOURCES += lstat.c
 
 ## end   gnulib module lstat
 
+## begin gnulib module maintainer-makefile
+
+EXTRA_DIST += $(top_srcdir)/maint.mk
+
+## end   gnulib module maintainer-makefile
+
 ## begin gnulib module malloc-posix
 
 
@@ -1332,6 +1383,13 @@ EXTRA_DIST += unitypes.h
 
 ## end   gnulib module unitypes
 
+## begin gnulib module useless-if-before-free
+
+
+EXTRA_DIST += $(top_srcdir)/build-aux/useless-if-before-free
+
+## end   gnulib module useless-if-before-free
+
 ## begin gnulib module vasnprintf
 
 
@@ -1341,6 +1399,13 @@ EXTRA_libgnu_la_SOURCES += asnprintf.c printf-args.c printf-parse.c vasnprintf.c
 
 ## end   gnulib module vasnprintf
 
+## begin gnulib module vc-list-files
+
+
+EXTRA_DIST += $(top_srcdir)/build-aux/vc-list-files
+
+## end   gnulib module vc-list-files
+
 ## begin gnulib module verify
 
 libgnu_la_SOURCES += verify.h