Merge tag 'v2.5.1_rc2'

Bison 2.5.1_rc2.

* tag 'v2.5.1_rc2': (34 commits)
  Bison 2.5.1_rc2.
  doc: fixes.
  build: fix ChangeLog generation.
  c++: compute the header guards.
  skeletons: remove support for unused directive.
  lalr1.cc: improve Doxygen documentation.
  lalr1.cc: extract stack.hh.
  news: convert to double quotes.
  space changes.
  build: do not prototype flex-generated functions.
  build: fix ChangeLog generation.
  Bison 2.5.1_rc1.
  tests: save/restore Autotest special files when checking XML support.
  tests: AT_SAVE_SPECIAL_FILES / AT_RESTORE_SPECIAL_FILES.
  tests: honor TESTSUITEFLAGS in all the check targets.
  build: do not enable c++ warnings on 0 when nullptr is not supported.
  maint: update gnulib.
  build: config.in.h.
  build: move silent rules.
  glr.c: reduce variable scopes.
  maint: maintainer-release-check.
  maint: shush a syntax-check.
  maint: prefer "commit message" to "log entry".
  command line: fix minor leaks.
  maint: we no longer maintain the ChangeLog.
  maint: fix the generation of the synclines for bison's parser.
  maint: regen.
  maint: import the xmemdup0 gnulib module.
  maint: remove left-over gnulib modules.
  maint: ignore files imported by autopoint.
  build: AC_PROG_LEX: use more readable variable names.
  maint: regen src/parse-gram.[ch]
  maint: simplify parse-gram.y
  maint: s/strncpy/memcpy/, when equivalent

Conflicts:
	Makefile.am
	NEWS
	data/glr.c
	data/lalr1.cc
	data/stack.hh
	examples/rpcalc/local.mk
	src/flex-scanner.h
	src/getargs.c
	src/output.c
	src/parse-gram.c
	src/parse-gram.h
	src/parse-gram.y
	tests/Makefile.am
	tests/bison.in

lib/.gitignore

@@ -22,6 +22,7 @@
 /c-ctype.h
 /c-strcase.h
 /c-strcasecmp.c
+/c-strcaseeq.h
 /c-strncasecmp.c
 /calloc.c
 /charset.alias
@@ -29,10 +30,14 @@
 /cloexec.h
 /close-hook.c
 /close-hook.h
+/close-stream.c
+/close-stream.h
 /close.c
+/closeout.c
+/closeout.h
 /config.charset
 /config.h
-/config.hin
+/config.in.h
 /configmake.h
 /dirname-lgpl.c
 /dirname.c
@@ -53,19 +58,25 @@
 /fcntl.c
 /fcntl.h
 /fcntl.in.h
+/fd-hook.c
+/fd-hook.h
 /fd-safer-flag.c
 /fd-safer.c
 /float+.h
+/float.c
 /float.h
 /float.in.h
 /fopen-safer.c
 /fopen.c
+/fpending.c
+/fpending.h
 /fprintf.c
 /fpucw.h
 /frexp.c
 /frexpl.c
 /fseterr.c
 /fseterr.h
+/fstat.c
 /getdtablesize.c
 /getopt.c
 /getopt.h
@@ -88,6 +99,7 @@
 /isnanl-nolibm.h
 /isnanl.c
 /iswblank.c
+/itold.c
 /ldexpl.c
 /localcharset.c
 /localcharset.h
@@ -105,14 +117,18 @@
 /mbuiter.h
 /memchr.c
 /memchr.valgrind
+/msvc-inval.c
+/msvc-inval.h
+/msvc-nothrow.c
+/msvc-nothrow.h
 /nonblocking.c
 /nonblocking.h
 /obstack.c
 /obstack.h
 /open.c
+/pathmax.h
 /perror.c
 /pipe-safer.c
-/pipe.c
 /pipe2-safer.c
 /pipe2.c
 /printf-args.c
@@ -124,10 +140,13 @@
 /printf-parse.c
 /printf-parse.h
 /printf.c
+/progname.c
+/progname.h
 /quote.c
 /quote.h
 /quotearg.c
 /quotearg.h
+/raise.c
 /rawmemchr.c
 /rawmemchr.valgrind
 /realloc.c
@@ -185,7 +204,10 @@
 /strchrnul.valgrind
 /strdup.c
 /streq.h
+/strerror-override.c
+/strerror-override.h
 /strerror.c
+/strerror_r.c
 /string.h
 /string.in.h
 /stripslash.c
@@ -205,6 +227,7 @@
 /sys_stat.in.h
 /sys_wait.h
 /sys_wait.in.h
+/sysexits.in.h
 /time.h
 /time.in.h
 /unistd--.h
@@ -236,33 +259,12 @@
 /wctype.in.h
 /wcwidth.c
 /xalloc-die.c
+/xalloc-oversized.h
 /xalloc.h
 /xmalloc.c
 /xsize.h
 /xstrndup.c
 /xstrndup.h
-/c-strcaseeq.h
-/fd-hook.c
-/fd-hook.h
-/float.c
-/fstat.c
-/itold.c
-/msvc-inval.c
-/msvc-inval.h
-/msvc-nothrow.c
-/msvc-nothrow.h
-/pathmax.h
-/raise.c
-/strerror-override.c
-/strerror-override.h
-/strerror_r.c
-/xalloc-oversized.h
-/close-stream.c
-/close-stream.h
-/closeout.c
-/closeout.h
-/fpending.c
-/fpending.h
-/sysexits.in.h
-/progname.c
-/progname.h
+/xmemdup0.c
+/xmemdup0.h
+/sys_types.in.h