protobuf: make it compile with __MIPSEB__ (ar71xx)

it's only compile tested

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@free.fr>

libs/protobuf/Makefile

@@ -16,6 +16,7 @@ PKG_SOURCE_URL:=http://protobuf.googlecode.com/files
 PKG_MD5SUM:=a72001a9067a4c2c4e0e836d0f92ece4
 
 PKG_BUILD_DEPENDS:=protobuf/host
+PKG_USE_MIPS16:=0
 
 PKG_INSTALL:=1
 

libs/protobuf/patches/001-mipseb-compile.patch

@@ -0,0 +1,11 @@
+--- a/src/google/protobuf/stubs/platform_macros.h
++++ b/src/google/protobuf/stubs/platform_macros.h
+@@ -49,7 +49,7 @@
+ #elif defined(__ARMEL__)
+ #define GOOGLE_PROTOBUF_ARCH_ARM 1
+ #define GOOGLE_PROTOBUF_ARCH_32_BIT 1
+-#elif defined(__MIPSEL__)
++#elif defined(__MIPSEL__) || defined(__MIPSEB__)
+ #define GOOGLE_PROTOBUF_ARCH_MIPS 1
+ #define GOOGLE_PROTOBUF_ARCH_32_BIT 1
+ #elif defined(__pnacl__)