modules/ims_registrar_pcscf: added -lpthread to Makefile to fix on Ubuntu 12

modules/ims_registrar_pcscf/Makefile

@@ -24,6 +24,7 @@ endif
 
 ifneq ($(OS),darwin)
 	LIBS += -lrt
+	LIBS += -lpthread
 endif
 
 DEFS+=-DOPENSER_MOD_INTERFACE