* lib/autoconf/functions.m4 (HAVE_DOPRNT): Fix missing-comma typo.

Reported by Peter Breitenlohner in:
http://lists.gnu.org/archive/html/autoconf-patches/2013-06/msg00007.html
doc: don't push 'static inline'

* doc/autoconf.texi (Function Portability): Use plain 'static',
not 'static inline', in example.  These days, 'static' is enough;
optimizing compilers can figure out the 'inline' on their own.