Bug 913246 - Fix configure with relative MOZCONFIG. r=gps

client.mk

@@ -120,6 +120,8 @@ endef
 MOZCONFIG_CONTENT := $(subst ||,$(CR),$(subst || ,$(CR),$(shell _PYMAKE=$(.PYMAKE) $(TOPSRCDIR)/$(MOZCONFIG_LOADER) $(TOPSRCDIR) | sed 's/$$/||/')))
 $(eval $(MOZCONFIG_CONTENT))
 
+export FOUND_MOZCONFIG
+
 # As '||' was used as a newline separator, it means it's not occurring in
 # lines themselves. It can thus safely be used to replaces normal spaces,
 # to then replace newlines with normal spaces. This allows to get a list