Fix handling of uint32_t arguments on the MIPS N32 ABI.

Patch by Mark H Weaver <mhw@netris.org>.

--- libffi/src/mips/ffi.c.orig	2013-03-16 07:19:39.000000000 -0400
+++ libffi/src/mips/ffi.c	2013-10-22 01:11:03.111985247 -0400
@@ -170,7 +170,14 @@
 		break;
 		  
 	      case FFI_TYPE_UINT32:
+#ifdef FFI_MIPS_N32
+		/* The N32 ABI requires that 32-bit integers
+		   be sign-extended to 64-bits, regardless of
+		   whether they are signed or unsigned. */
+		*(ffi_arg *)argp = *(SINT32 *)(* p_argv);
+#else
 		*(ffi_arg *)argp = *(UINT32 *)(* p_argv);
+#endif
 		break;
 
 	      /* This can only happen with 64bit slots.  */
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