aclocal.m4: fix a typo

[Rafał Mużyło]

There's a trivial typo in aclocal.m4 - discovered accidentally by
running 'make -j2'.

-------------- next part --------------
--- aclocal.m4	2011-11-04 20:02:31.000000000 +0100
+++ aclocal.m4	2011-11-04 23:00:59.000000000 +0100
@@ -220,7 +220,7 @@
         wine_fn_append_rule ALL_MAKEFILE_DEPENDS \
 "$ac_dir/rsrc.pot: $ac_dir/Makefile dummy
 	@cd $ac_dir && \$(MAKE) rsrc.pot
-$ac_dir/srsrc.pot: tools/wrc include"
+$ac_dir/rsrc.pot: tools/wrc include"
     fi
 }