Adjust to recent changes to gnulib bootstrap.

* .cvsignore, build-aux/.cvsignore, doc/.cvsignore, etc/.cvsignore:
* examples/calc++/.cvsignore, lib/.cvsignore, m4/.cvsignore:
* po/.cvsignore, runtime-po/.cvsignore, src/.cvsignore:
* tests/.cvsignore: Remove; I don't use CVS to maintain Bison
anymore and don't know of anybody else who does.  If someone needs
these files, they can resurrect them.
* .gitignore, build-aux/.gitignore, doc/.gitignore, lib/.gitignore:
* m4/.gitignore, po/.gitignore, runtime-po/.gitignore:
Omit leading '/', since bootstrap omits it.
Adjust file names to match current contents better.
* bootstrap: Sync from gnulib: this contains the new gnulib_mk_hook
installed just for us.
* bootstrap.conf (excluded_files): Don't exclude codeset.m4,
glibc21.m4, inttypes_h.m4, size_max.m4, xsize.m4, as they are now
needed somehow.  Don't have time to look into why.
(gnulib_modules): Change malloc to malloc-gnu.  Do we really assume
the GNU malloc behavior, where malloc (0) != NULL unless we're
out of storage?  If not, we can omit malloc-gnu; but for now I left
it in to be safe.
(vc_ignore): Remove.
(gnulib_mk_hook): New function.
* README-hacking: Renamed from HACKING, since gnulib bootstrap now
uses that convention.

.gitignore

@@ -1,32 +1,32 @@
+.tarball-version
+.version
 /*.cache
 /*.flc
 /*.prj
 /*~
-/.tarball-version
-/.version
-/ABOUT-NLS
-/COPYING
-/GNUmakefile
-/INSTALL
-/Makefile
-/Makefile.in
 /_*
-/a.exe
-/a.out
-/aclocal.m4
-/b.out
-/bison-*
-/conf[0-9]*
-/confdefs*
-/config.log
-/config.status
-/configure
-/configure.lineno
-/conftest*
-/gnulib
-/javacomp.sh
-/javaexec.sh
-/maint.mk
-/patches
-/releases
-/stamp-h*
+ABOUT-NLS
+COPYING
+GNUmakefile
+INSTALL
+Makefile
+Makefile.in
+a.exe
+a.out
+aclocal.m4
+b.out
+bison-*
+conf[0-9]*
+confdefs*
+config.log
+config.status
+configure
+configure.lineno
+conftest*
+gnulib
+javacomp.sh
+javaexec.sh
+maint.mk
+patches
+releases
+stamp-h*