[MIPS] Implementation of sel_ldr for MIPS architecture.

src/include/portability.h

Index: src/include/portability.h
diff --git a/src/include/portability.h b/src/include/portability.h
index 97a35b4963b199f53d7cf4e042ccbf2befe5d410..bf0af8397c0cd4f31a464f0f55734c8071df8f1c 100644
--- a/src/include/portability.h
+++ b/src/include/portability.h
@@ -107,6 +107,12 @@ struct timezone {
 #define NACL_ARCH_CPU_32_BITS 1
 #define NACL_HOST_WORDSIZE 32
 #define NACL_WCHAR_T_IS_UNSIGNED 1
+#elif defined(__mips__)
+#define NACL_ARCH_CPU_MIPS_FAMILY 1
+#define NACL_ARCH_CPU_MIPS32 1
+#define NACL_ARCH_CPU_32_BITS 1
+#define NACL_HOST_WORDSIZE 32
+#define NACL_WCHAR_T_IS_UNSIGNED 0
 #elif defined(__pnacl__)
 #define NACL_HOST_WORDSIZE 32
 #else