can't use this mpdigdiv.s on mips32 cpus

Reference: /n/atom/patch/applied2013/libmpmips32
Date: Wed Jul 31 18:31:30 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/libmp/mips/mkfile	Wed Jul 31 18:31:18 2013
+++ /sys/src/libmp/mips/mkfile	Wed Jul 31 18:31:18 2013
@@ -2,12 +2,13 @@
 </mips/mkfile
 
 LIB=/$objtype/lib/libmp.a
+# can't use this mpdigdiv.s on mips32 cpus
 SFILES=\
 	mpvecadd.s\
 	mpvecsub.s\
 	mpvecdigmuladd.s\
 	mpvecdigmulsub.s\
-	mpdigdiv.s\
+#	mpdigdiv.s\
 
 HFILES=/$objtype/include/u.h /sys/include/mp.h ../port/dat.h