iax and empty core for opal

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@87 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/mod_iaxchan/Makefile

+#CFLAGS += -I/usr/src/common/src
+LDFLAGS += -liax
+
+$(MOD).so: $(MOD).c
+	$(CC) $(CFLAGS) -fPIC -c $(MOD).c -o $(MOD).o 
+	$(CC) -shared -Xlinker -x -o $(MOD).so  $(MOD).o $(LDFLAGS)
+
+all:	$(MOD).so
+
+clean:
+	rm -fr *.so *.o *~
+