autofs: disable for musl
autofs requires nsswitch which musl libc does not implement. Commit
873040371b14 (autofs: allow to use libtirpc) removed the
BR2_TOOLCHAIN_HAS_NATIVE_RPC dependency, making autofs available for
musl. Disable musl explicitly.
Fixes:
http://autobuild.buildroot.net/results/a54/
a549b62fbf03474ffd8586869637d083de275091/
http://autobuild.buildroot.net/results/b32/
b3276b2cbd1e1c260f8df4c3945f51ddc09d492f/
http://autobuild.buildroot.net/results/10b/
10b5c5b13971214d0439b715f1a46c78a5249309/
Cc: Waldemar Brodkorb <wbx@openadk.org>
Cc: Jonathan Ben Avraham <yba@tkos.co.il>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>