disable exports from a bunch more tools, those without plugins.

llvm-svn: 65558
diff --git a/llvm/tools/llvm-extract/Makefile b/llvm/tools/llvm-extract/Makefile
index 21fe37b..2ef8841 100644
--- a/llvm/tools/llvm-extract/Makefile
+++ b/llvm/tools/llvm-extract/Makefile
@@ -12,4 +12,7 @@
 TOOLNAME = llvm-extract
 LINK_COMPONENTS := ipo bitreader bitwriter
 
+# This tool has no plugins, optimize startup time.
+TOOL_NO_EXPORTS = 1
+
 include $(LEVEL)/Makefile.common