Correctly set rpath on Mac OS X for executable tools.  Note that I am not certain this is the best fix; the code immediately above looks confused, as it first checks to see if we are NOT on Darwin and then checks the Darwin version number.  This fix allows c-index-test (in Clang) to run outside of running the regression test suite.  I would appreciate if someone reviewed this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108416 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile.rules b/Makefile.rules
index 9e77efb..12582f6 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -632,7 +632,12 @@
   endif
 endif
 endif
+else
+ifneq ($(DARWIN_MAJVERS),4)
+  LD.Flags += $(RPATH) -Wl,@executable_path/../lib
 endif
+endif
+
 
 #----------------------------------------------------------
 # Options To Invoke Tools