Tests must not include headers from the host system.
It looks like the include wasn't needed for anything, so just remove it.
This makes check-clang work in a `git bash` launched from a cmd.exe
that isn't an MSVC shell (that is, %INCLUDE% isn't set).
// RUN: c-index-test -retain-excluded-conditional-blocks %s | FileCheck %s
-#include <stdint.h>
-
-// CHECK: TypedefDecl=intptr_t
-
// CHECK: [[@LINE+1]]:12: ObjCInterfaceDecl=MyCls
@interface MyCls
// CHECK: [[@LINE+1]]:8: ObjCInstanceMethodDecl=some_meth