intl is not included in libc, disable it as is done with the target
package.
argp is also not included. Add build depends for argp-standalone.
fts is also not included. Add build depends for musl-fts.
Disable shared libraries to avoid having to manually add rpath.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
8a5d095969