fix -L so we don't have to use DYLD anymore nor symlink it

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@754 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_portaudio/Makefile

-LDFLAGS += -lportaudio -L/usr/local/lib
+LDFLAGS += -lportaudio -L$(PREFIX)/lib
 MYOBJS = pablio.o ringbuffer.o
 
 all:	depends $(MODNAME).$(DYNAMIC_LIB_EXTEN)