Use -Bsymbolic when linking components on FreeBSD.

Thanks to Joe Marcus Clarke <marcus@freebsd.org> for the patch.
Bug #190844 r=cls a=asa

config/rules.mk

@@ -436,6 +436,12 @@ endif
 endif
 endif
 
+ifeq ($(OS_ARCH),FreeBSD)
+ifdef IS_COMPONENT
+EXTRA_DSO_LDOPTS += -Wl,-Bsymbolic
+endif
+endif
+
 ifeq ($(OS_ARCH),NetBSD)
 ifneq (,$(filter arc cobalt hpcmips mipsco newsmips pmax sgimips,$(OS_TEST)))
 ifeq ($(MODULE),layout)