Don't look for __builtin_va_list; it isn't present for all targets

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82757 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Index/c-index-api-test.m b/test/Index/c-index-api-test.m
index d4c6006..5eb1df7 100644
--- a/test/Index/c-index-api-test.m
+++ b/test/Index/c-index-api-test.m
@@ -6,7 +6,7 @@
 // CHECK: <invalid loc>:0:0: ObjCInterfaceDecl=Protocol [Context=c-index-api-test.m]
 // CHECK: <invalid loc>:0:0: TypedefDecl=id [Context=c-index-api-test.m]
 // CHECK: <invalid loc>:0:0: TypedefDecl=Class [Context=c-index-api-test.m]
-// CHECK: <built-in>:75:15: TypedefDecl=__builtin_va_list [Context=c-index-api-test.m]
+// 
 
 @interface Foo 
 {