mold: dont allow on MacOS
Mold does not really work on MacOS, when attempting to use it for example
for ubus:
mold: get_self_path is not supportedcollect2: error: ld returned 1 exit status
Which was introduced by [1] so it seems that MacOS is not supported, so
lets make it non selectable when MacOS is the host.
[1] https://github.com/rui314/mold/commit/f9a37e9dd43681758bbc5647ba9e596ec4ea9f33
Link: https://github.com/openwrt/openwrt/pull/18575
Signed-off-by: Robert Marko <[email protected]>