Fix race condition in Makefile

llvm-svn: 5380
diff --git a/llvm/lib/ExecutionEngine/Makefile b/llvm/lib/ExecutionEngine/Makefile
index ee12726..123ccb7 100644
--- a/llvm/lib/ExecutionEngine/Makefile
+++ b/llvm/lib/ExecutionEngine/Makefile
@@ -1,6 +1,6 @@
 LEVEL = ../..
 TOOLNAME = lli
-PARALLEL_DIRS = Interpreter JIT
+DIRS = Interpreter JIT
 
 JITLIBS  = lli-jit codegen x86
 USEDLIBS = lli-interpreter $(JITLIBS) bcreader vmcore analysis.a support.a target.a