don't try to access filedescriptors on windows

git-svn-id: http://skia.googlecode.com/svn/trunk@7847 2bbb7eff-a529-9590-31e7-b0007b416f81

src/core/SkFDStream.cpp

@@ -8,6 +8,8 @@
 #include "SkStream.h"
 #include <unistd.h>
 
+#ifndef SK_BUILD_FOR_WIN
+
 //#define TRACE_FDSTREAM
 
 SkFDStream::SkFDStream(int fileDesc, bool closeWhenDone)
@@ -89,3 +91,5 @@ size_t SkFDStream::read(void* buffer, size_t size) {
     }
     return 0;
 }
+
+#endif