[fsxs] Remove APR and APR-UTIL libraries from fsxs LIBS variable.

"LIBS" in the final fsxs script will be empty now.
We still link against libfreeswitch when building a module,
but we don't explicitly list (some of) its dependency libs anymore
(this list was not complete anyway).

This fixes a bogus /path_to_source/expat.la entry in LIBS that
came from "apu-config --libs".

Tested on Gentoo x86_64 (binutils 2.20.1) and Centos 5.5 (binutils 2.17.50).
Tested-by: Stefan Knoblich <s.knoblich@axsentis.de>
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

Makefile.am

@@ -349,7 +349,7 @@ scripts/fsxs: scripts/fsxs.in
 	    -e "s|@INCLUDES\@|-I$(prefix)/include|" \
 	    -e "s|@SOLINK\@|$(SOLINK)|" \
 	    -e "s|@LDFLAGS\@|-L$(prefix)/lib|" \
-	    -e "s|@LIBS\@|`./libs/apr/apr-1-config --libs` `./libs/apr-util/apu-1-config --libs`|" \
+	    -e "s|@LIBS\@||" \
 	    $(top_srcdir)/scripts/fsxs.in > scripts/fsxs
 
 ##