Adapt to switch to Clang for Windows host builds

Bug: http://b/69933068

Bug: http://b/91353691: std::chrono_utils is not available in the
libstdc++ in the mingw/gcc prebuilts.  They can be used once we switch
to using libc++ for Windows host.

Test: m native-host-cross with Clang
Change-Id: If9f0f1f201d5e4e445890075ad64c2d6086b0491
diff --git a/base/include/android-base/chrono_utils.h b/base/include/android-base/chrono_utils.h
index c3396ee..b7647f2 100644
--- a/base/include/android-base/chrono_utils.h
+++ b/base/include/android-base/chrono_utils.h
@@ -20,7 +20,7 @@
 #include <chrono>
 #include <sstream>
 
-#if __cplusplus > 201103L  // C++14
+#if __cplusplus > 201103L && !defined(__WIN32)  // C++14
 using namespace std::chrono_literals;
 #endif