maint: resync files from upstream

'make syntax-check' complained about something that was already
fixed upstream in doc/standards.texi, so I ran 'make update', and
omitted lib/Autom4te as that still has some issues to be sorted out.

* GNUmakefile: Resync from upstream.
* build-aux/announce-gen: Likewise.
* build-aux/config.guess: Likewise.
* build-aux/config.sub: Likewise.
* build-aux/git-version-gen: Likewise.
* build-aux/gitlog-to-changelog: Likewise.
* build-aux/gnupload: Likewise.
* build-aux/move-if-change: Likewise.
* build-aux/texinfo.tex: Likewise.
* build-aux/update-copyright: Likewise.
* build-aux/useless-if-before-free: Likewise.
* build-aux/vc-list-files: Likewise.
* doc/gendocs_template: Likewise.
* doc/standards.texi: Likewise.
* m4/autobuild.m4: Likewise.
* maint.mk: Likewise.

1 files changed, 4 insertions, 2 deletions

diff --git a/maint.mk b/maint.mk
index ce9ed058..2b454a15 100644
--- a/maint.mk
+++ b/maint.mk
@@ -1370,7 +1370,8 @@ endef
 
 .PHONY: no-submodule-changes
 no-submodule-changes:
-	$(AM_V_GEN)if test -d $(srcdir)/.git; then			\
+	$(AM_V_GEN)if test -d $(srcdir)/.git				\
+		&& git --version >/dev/null 2>&1; then			\
 	  diff=$$(cd $(srcdir) && git submodule -q foreach		\
 		  git diff-index --name-only HEAD)			\
 	    || exit 1;							\
@@ -1388,7 +1389,8 @@ submodule-checks ?= no-submodule-changes public-submodule-commit
 # cannot be built from a fresh clone.
 .PHONY: public-submodule-commit
 public-submodule-commit:
-	$(AM_V_GEN)if test -d $(srcdir)/.git; then			\
+	$(AM_V_GEN)if test -d $(srcdir)/.git				\
+		&& git --version >/dev/null 2>&1; then			\
 	  cd $(srcdir) &&						\
 	  git submodule --quiet foreach					\
 	      test '"$$(git rev-parse "$$sha1")"'			\