FS-5039 somewhat of a temporary fix unless it works for everyone

Makefile.am

@@ -86,7 +86,7 @@ CORE_CFLAGS += -I$(switch_srcdir)/libs/spandsp/src -I$(switch_srcdir)/libs/tiff-
 
 CORE_LIBS  = libs/apr-util/libaprutil-1.la libs/apr/libapr-1.la
 CORE_LIBS += libs/sqlite/libsqlite3.la libs/pcre/libpcre.la libs/speex/libspeex/libspeexdsp.la
-CORE_LIBS += libs/sofia-sip/libsofia-sip-ua/sdp/libsdp.la libs/sofia-sip/libsofia-sip-ua/su/libsu.la
+CORE_LIBS += libs/sofia-sip/libsofia-sip-ua/sdp/.libs/libsdp.a libs/sofia-sip/libsofia-sip-ua/su/.libs/libsu.a
 
 if ENABLE_SRTP
 CORE_CFLAGS += -DENABLE_SRTP
@@ -420,7 +420,7 @@ libs/libzrtp/projects/gnu/build/libzrtp.a:
 libs/sofia-sip/Makefile:
 	cd libs/sofia-sip && sh ./configure.gnu --prefix=$(prefix)
 
-libs/sofia-sip/libsofia-sip-ua/sdp/libsdp.la libs/sofia-sip/libsofia-sip-ua/su/libsu.la: libs/sofia-sip/.update libs/sofia-sip/Makefile
+libs/sofia-sip/libsofia-sip-ua/sdp/.libs/libsdp.a libs/sofia-sip/libsofia-sip-ua/su/.libs/libsu.a: libs/sofia-sip/.update libs/sofia-sip/Makefile
 	@cd libs/sofia-sip && $(MAKE) noop
 	@cd libs/sofia-sip && $(MAKE) SOFIA_CFLAGS="$(SWITCH_AM_CFLAGS)"
 	@$(TOUCH_TARGET)