xfsprogs: disable on musl

Despite a recent bump, xfsprogs still doesn't build on musl. It's been
failing for a long long time, so let's disable it in this configuration.

Fixes:

  http://autobuild.buildroot.net/results/c6cd42da1abe2936872da1f9db093ffc72be3c15/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/xfsprogs/Config.in

@@ -1,11 +1,12 @@
-comment "xfsprogs needs a toolchain w/ wchar"
+comment "xfsprogs needs a glibc or uClibc toolchain w/ wchar"
 	depends on BR2_USE_MMU
-	depends on !BR2_USE_WCHAR
+	depends on !BR2_USE_WCHAR || BR2_TOOLCHAIN_USES_MUSL
 
 config BR2_PACKAGE_XFSPROGS
 	bool "xfsprogs"
 	depends on BR2_USE_MMU # fork()
 	depends on BR2_USE_WCHAR # util-linux
+	depends on !BR2_TOOLCHAIN_USES_MUSL
 	select BR2_PACKAGE_UTIL_LINUX
 	select BR2_PACKAGE_UTIL_LINUX_LIBUUID
 	select BR2_PACKAGE_UTIL_LINUX_LIBBLKID