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.

po/.gitignore

@@ -1,22 +1,22 @@
-/*.gmo
-/*.po
-/*.po~
-/.reference
-/LINGUAS
-/Makefile
-/Makefile.in
-/Makefile.in.in
-/Makevars
-/Makevars.template
-/POTFILES
-/Rules-quot
-/bison.pot
-/boldquot.sed
-/en@boldquot.header
-/en@quot.header
-/insert-header.sed
-/insert-header.sin
-/quot.sed
-/remove-potcdate.sed
-/remove-potcdate.sin
-/stamp-po
+*.gmo
+*.po
+*.po~
+.reference
+LINGUAS
+Makefile
+Makefile.in
+Makefile.in.in
+Makevars
+Makevars.template
+POTFILES
+Rules-quot
+bison.pot
+boldquot.sed
+en@boldquot.header
+en@quot.header
+insert-header.sed
+insert-header.sin
+quot.sed
+remove-potcdate.sed
+remove-potcdate.sin
+stamp-po