Pull in Windows compatibility header.

Needed for O_CLOEXEC, O_NOFOLLOW, and DEFFILEMODE.

Change-Id: Id6c0465a6559c30ac8c085c28be0d47c9738f02a
diff --git a/base/file.cpp b/base/file.cpp
index 118071e..a51c5ff 100644
--- a/base/file.cpp
+++ b/base/file.cpp
@@ -26,6 +26,7 @@
 #include "base/macros.h"  // For TEMP_FAILURE_RETRY on Darwin.
 #define LOG_TAG "base.file"
 #include "cutils/log.h"
+#include "utils/Compat.h"
 
 namespace android {
 namespace base {