allow x86_64 newlib toolchain building

scripts/create-menu

@@ -90,7 +90,7 @@ for arch in $(cat $topdir/target/arch.lst);do
 	printf "config ADK_TARGET_ARCH_$ARCH\n" >> $topdir/target/config/Config.in.arch.choice
 	printf "\tbool \"$arch\"\n" >> $topdir/target/config/Config.in.arch.choice
 	case $arch in
-		alpha|ia64|sh|s390|tile|ppc64|mips64|x86_64)
+		alpha|ia64|sh|s390|tile|ppc64|mips64)
 		  printf "\tdepends on ADK_TARGET_OS_LINUX\n" >> $topdir/target/config/Config.in.arch.choice
 		  ;;
 		cr16|epiphany|m32r|mn10300|moxie|msp430|v850)

target/config/Config.in.libc

@@ -114,6 +114,7 @@ config ADK_TARGET_LIB_NEWLIB
 		ADK_TARGET_ARCH_SPARC64 || \
 		ADK_TARGET_ARCH_V850 || \
 		ADK_TARGET_ARCH_X86 || \
+		ADK_TARGET_ARCH_X86_64 || \
 		ADK_TARGET_ARCH_XTENSA) && ADK_TARGET_OS_BAREMETAL
 	help
 	  https://sourceware.org/newlib/