add mips n32 port (ILP32 ABI for mips64)
based on patch submitted by Jaydeep Patil, with minor changes.
diff --git a/configure b/configure
index 969671d..53241ab 100755
--- a/configure
+++ b/configure
@@ -618,6 +618,7 @@
fi
if test "$ARCH" = "mips64" ; then
+trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32
trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf