fix udhcpc for x32, from musl-git

toolchain/musl/patches/musl-x32.patch

@@ -1,12 +0,0 @@
-diff -Nur musl-0.9.15.orig/configure musl-0.9.15/configure
---- musl-0.9.15.orig/configure	2014-03-16 21:17:29.000000000 +0100
-+++ musl-0.9.15/configure	2014-03-16 22:46:46.000000000 +0100
-@@ -226,7 +226,7 @@
- mips64*|powerpc64*) fail "$0: unsupported target \"$target\"" ;;
- arm*) ARCH=arm ;;
- i?86*) ARCH=i386 ;;
--x86_64-x32*|x32*) ARCH=x32 ;;
-+x86_64*x32) ARCH=x32 ;;
- x86_64*) ARCH=x86_64 ;;
- mips*) ARCH=mips ;;
- microblaze*) ARCH=microblaze ;;