b=490813; linker error in browser/components/build with --as-needed

Gentoo bug 267900
diff --git a/browser/components/build/Makefile.in b/browser/components/build/Makefile.in
--- a/browser/components/build/Makefile.in
+++ b/browser/components/build/Makefile.in
@@ -65,11 +65,7 @@
 SHARED_LIBRARY_LIBS += ../shell/src/$(LIB_PREFIX)shellservice_s.$(LIB_SUFFIX)
 endif
 
-EXTRA_DSO_LDOPTS += \
-	$(call EXPAND_LIBNAME_PATH,unicharutil_external_s,$(LIBXUL_DIST)/lib) \
-	$(LIBXUL_DIST)/lib/$(LIB_PREFIX)xpcomglue_s.$(LIB_SUFFIX) \
-	$(MOZ_COMPONENT_LIBS) \
-	$(NULL)
+EXTRA_DSO_LDOPTS += $(call EXPAND_LIBNAME_PATH,unicharutil_external_s,$(LIBXUL_DIST)/lib)
 
 # migration requires mozreg, which doesn't build on WINCE; only include
 # it on non-CE
@@ -80,6 +76,13 @@
 EXTRA_DSO_LDOPTS += $(LIBXUL_DIST)/lib/$(LIB_PREFIX)mozreg_s.$(LIB_SUFFIX)
 endif
 
+# This has to come after the above chunk, because mozreg_s has dependencies on
+# stuff in MOZ_COMPONENT_LIBS.
+EXTRA_DSO_LDOPTS += \
+	$(LIBXUL_DIST)/lib/$(LIB_PREFIX)xpcomglue_s.$(LIB_SUFFIX) \
+	$(MOZ_COMPONENT_LIBS) \
+	$(NULL)
+
 # Mac: Need to link with CoreFoundation for Mac Migrators (PList reading code)
 # GTK2: Need to link with glib for GNOME shell service
 ifneq (,$(filter mac cocoa gtk2,$(MOZ_WIDGET_TOOLKIT)))