remove autom4te.cache and aclocal.m4, to enforce a recreation, otherwise...

remove autom4te.cache and aclocal.m4, to enforce a recreation, otherwise changes in the m4 files might be ignored

[[Imported from SVN: r850]]

autogen.sh

@@ -82,6 +82,8 @@ libtoolize --force
 
 # prepare everything
 echo "--> aclocal..."
+rm -f aclocal.m4
+rm -rf autom4te.cache
 aclocal$AMVERSION $ACLOCAL_FLAGS
 
 # applications should provide a config.h for now