Follow on to r9408, implement sk_fileno in SkOSFile_none.cpp.

git-svn-id: http://skia.googlecode.com/svn/trunk@9410 2bbb7eff-a529-9590-31e7-b0007b416f81

src/ports/SkOSFile_none.cpp

@@ -11,6 +11,10 @@ bool sk_fidentical(SkFILE* a, SkFILE* b) {
     return false;
 }
 
+int sk_fileno(SkFILE* f) {
+    return -1;
+}
+
 void sk_fmunmap(const void* addr, size_t length) { }
 
 void* sk_fdmmap(int fd, size_t* size) {