[MIPS] Move definition of IRIX compat constant into IRIX compat code.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/irixsig.c b/arch/mips/kernel/irixsig.c
index 7193647..2132485 100644
--- a/arch/mips/kernel/irixsig.c
+++ b/arch/mips/kernel/irixsig.c
@@ -323,6 +323,9 @@
 	int _unused0[2];
 };
 
+#define SIG_SETMASK32	256	/* Goodie from SGI for BSD compatibility:
+				   set only the low 32 bit of the sigset.  */
+
 #ifdef DEBUG_SIG
 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 {