Bazel client: fix compilation on Windows

Add "#include <fcntl.h>".

See https://github.com/bazelbuild/bazel/issues/2107

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MOS_MIGRATED_REVID=140131127

src/main/cpp/blaze_util_windows.cc

diff --git a/src/main/cpp/blaze_util_windows.cc b/src/main/cpp/blaze_util_windows.cc
index 962bd28..65b0699 100644
--- a/src/main/cpp/blaze_util_windows.cc
+++ b/src/main/cpp/blaze_util_windows.cc
@@ -16,6 +16,7 @@
 #include <limits.h>
 
 #ifndef COMPILER_MSVC
+#include <fcntl.h>
 #include <sys/cygwin.h>
 #include <sys/socket.h>
 #include <sys/stat.h>