[patch] Fix configure.ac for Autoconf 2.64 compability (3.0.8 and 3.0.9rc1)

[Samuli Suominen]

Fix for autoconf-2.64 attached. Solving this problem,

***** aclocal *****
***** PWD: /var/tmp/portage/dev-libs/libffi-3.0.9_rc1/work/libffi-3.0.9rc1
***** aclocal

/usr/share/aclocal/sdlmm.m4:12: warning: underquoted definition of
AM_PATH_SDLMM
/usr/share/aclocal/sdlmm.m4:12:   run info '(automake)Extending aclocal'
/usr/share/aclocal/sdlmm.m4:12:   or see
http://sources.redhat.com/automake/automake.html#Extending-aclocal
configure.ac:23: error: m4_copy: won't overwrite defined macro:
_AC_ARG_VAR_PRECIOUS
configure.ac:23: the top level
autom4te-2.64: /usr/bin/m4 failed with exit status: 1
aclocal-1.10: autom4te failed with exit status: 1
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