Enable ReparseWithModule only if threads

[Yaron Keren]

This addresses http://llvm.org/pr20325, this unit test fails when threads
are disabled.
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Index: tools/clang/unittests/libclang/LibclangTest.cpp
===================================================================
--- tools/clang/unittests/libclang/LibclangTest.cpp	(revision 241427)
+++ tools/clang/unittests/libclang/LibclangTest.cpp	(working copy)
@@ -431,6 +431,7 @@
   EXPECT_EQ(0U, clang_getNumDiagnostics(ClangTU));
 }
 
+#if LLVM_ENABLE_THREADS
 TEST_F(LibclangReparseTest, ReparseWithModule) {
   const char *HeaderTop = "#ifndef H\n#define H\nstruct Foo { int bar;";
   const char *HeaderBottom = "\n};\n#endif\n";
@@ -465,3 +466,4 @@
   ASSERT_TRUE(ReparseTU(0, nullptr /* No unsaved files. */));
   EXPECT_EQ(0U, clang_getNumDiagnostics(ClangTU));
 }
+#endif