8012564: The SOURCE value in release file of JDK 8 doesn't contain valid changesets for some OS since b74

Reviewed-by: alanb, tbell
diff --git a/common/makefiles/Main.gmk b/common/makefiles/Main.gmk
index 0120c1f..6cfcfa8 100644
--- a/common/makefiles/Main.gmk
+++ b/common/makefiles/Main.gmk
@@ -192,7 +192,7 @@
 $(OUTPUT_ROOT)/source_tips: FRC
 	@$(MKDIR) -p $(@D)
 	@$(RM) $@
-	@$(if $(HG),$(call GetSourceTips),$(ECHO) "hg not installed" > $@)
+	@$(call GetSourceTips)
 
 
 # Remove everything, except the output from configure.