configure: recognize x86_64-x32 and x32
x32 is the internal arch name, but glibc uses x86_64-x32.
there doesn't exist a specific triple for x32 in gcc and binutils.
you're supposed to build your compiler for x86_64 and configure
it with multilib support for "mx32".
however it turns out that using a triple of x86_64-x32 makes
gcc and binutils pick up the right arch (they detect it as x86_64)
and allows us to have a unique triple for cross-compiler toolchains.
diff --git a/configure b/configure
index aa3cb42..ca4dd0b 100755
--- a/configure
+++ b/configure
@@ -224,6 +224,7 @@
case "$target" in
arm*) ARCH=arm ;;
i?86*) ARCH=i386 ;;
+x86_64-x32*|x32*) ARCH=x32 ;;
x86_64*) ARCH=x86_64 ;;
mips-*|mipsel-*) ARCH=mips ;;
microblaze-*) ARCH=microblaze ;;