FreeSWITCH: Make libzrtp library paths absolute (or relative to top srcdir), fixes FS-4260.

Reference-URL: http://jira.freeswitch.org/browse/FS-4260Tested-by: Stefan Knoblich <stkn@openisdn.net>
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Makefile.am

@@ -157,8 +157,8 @@ if ENABLE_ZRTP
 CORE_CFLAGS += -I$(switch_srcdir)/libs/libzrtp/third_party/bgaes
 CORE_CFLAGS += -I$(switch_srcdir)/libs/libzrtp/third_party/bnlib
 CORE_CFLAGS += -isystem $(switch_srcdir)/libs/libzrtp/include
-ZRTP_LDFLAGS = -Llibs/libzrtp/third_party/bnlib
-ZRTP_LDFLAGS += -Llibs/libzrtp/projects/gnu/build
+ZRTP_LDFLAGS = -L$(switch_srcdir)/libs/libzrtp/third_party/bnlib
+ZRTP_LDFLAGS += -L$(switch_srcdir)/libs/libzrtp/projects/gnu/build
 ZRTP_LIBS = -lbn -lzrtp
 libfreeswitch_la_LDFLAGS += $(ZRTP_LDFLAGS)
 libfreeswitch_la_LIBADD += $(ZRTP_LIBS)