Insulate libportable from bionic changes.

Really libportable should take its own copy of BSD's <machine/asm.h>,
rather than relying on bionic's hacked-about copies.

Change-Id: I02248045a903dc4ca0d6ed1054ecb1cd54da335e

ndk/sources/android/libportable/arch-mips/_setjmp.S

@@ -29,6 +29,7 @@
  *
  */
 
+#include <asm-generic/portability.h>
 #include <machine/asm.h>
 #include <machine/regnum.h>
 

ndk/sources/android/libportable/common/include/asm-generic/portability.h

@@ -28,4 +28,8 @@
 #define REAL(f)     __real_ ## f
 #endif
 
+#if defined(__mips__) && !defined(END)
+#define END(f) .cfi_endproc; .end f
+#endif
+
 #endif /* _ASM_PORTABILITY_H_ */