Add U_PF_NATIVE_CLIENT

source/common/unicode/platform.h

Index: source/common/unicode/platform.h
===================================================================
--- source/common/unicode/platform.h	(revision 277999)
+++ source/common/unicode/platform.h	(working copy)
@@ -121,8 +121,10 @@
 #define U_PF_QNX 3700
 /** Linux is a Unix-like operating system. @internal */
 #define U_PF_LINUX 4000
+/** Native Client is pretty close to Linux. @internal */
+#define U_PF_NATIVE_CLIENT 4050
 /** Android is based on Linux. @internal */
-#define U_PF_ANDROID 4050
+#define U_PF_ANDROID 4100
 /** "Classic" Mac OS (1984-2001) @internal */
 #define U_PF_CLASSIC_MACOS 8000
 /** z/OS is the successor to OS/390 which was the successor to MVS. @internal */
@@ -142,6 +144,8 @@
 #   define U_PLATFORM U_PF_ANDROID
     /* Android wchar_t support depends on the API level. */
 #   include <android/api-level.h>
+#elif defined(__native_client__)
+#   define U_PLATFORM U_PF_NATIVE_CLIENT
 #elif defined(linux) || defined(__linux__) || defined(__linux)
 #   define U_PLATFORM U_PF_LINUX
 #elif defined(__APPLE__) && defined(__MACH__)