Start making all .cpp files compile-able on all platforms.

src/ports/SkOSLibrary_posix.cpp

Index: src/ports/SkOSLibrary_posix.cpp
diff --git a/src/ports/SkOSLibrary_posix.cpp b/src/ports/SkOSLibrary_posix.cpp
index cca55f16a1c9787a13a4c10c453b470bc82107e0..1571e20085889d1ad431db0a35208c3922aa608c 100644
--- a/src/ports/SkOSLibrary_posix.cpp
+++ b/src/ports/SkOSLibrary_posix.cpp
@@ -5,6 +5,9 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+#include "SkTypes.h"
+#if !defined(SK_BUILD_FOR_WIN32)
+
 #include "SkOSLibrary.h"
 
 #include <dlfcn.h>
@@ -16,3 +19,4 @@ void* DynamicLoadLibrary(const char* libraryName) {
 void* GetProcedureAddress(void* library, const char* functionName) {
     return dlsym(library, functionName);
 }
+#endif//!defined(SK_BUILD_FOR_WIN32)