musl xtensa support is not upstream

target/config/Config.in.libc

@@ -56,8 +56,7 @@ config ADK_TARGET_LIB_MUSL
 		ADK_TARGET_ARCH_S390 || \
 		ADK_TARGET_ARCH_SH || \
 		ADK_TARGET_ARCH_X86 || \
-		ADK_TARGET_ARCH_X86_64 || \
-		ADK_TARGET_ARCH_XTENSA) && ADK_TARGET_OS_LINUX
+		ADK_TARGET_ARCH_X86_64 ) && ADK_TARGET_OS_LINUX
 	help
  	  http://musl-libc.org