Fix PATH order at openrc-init

[sulincix]

This commit fix issue about #641

[vapier]

looks fine, but would be good to dig in the history a little first to see why it ended up this way

[WhyNotHugo]

path_default was defined in cfded51 which reads "This adds the default path setting from sysvinit.".

_PATH was defined initially in 0e6eb0f. There's no explanation of the order, it's simply been this way since it was initially defined.

[awilfox]

Would it be better to use getconf PATH (in shell) and confstr(_CS_PATH) (in C)? That is actually the most efficient way to determine a "default" PATH on a POSIX system.

Though, unfortunately, musl's _CS_PATH is /bin:/usr/bin, but that should probably be fixed upstream…

[navi-desu]

Though, unfortunately, musl's _CS_PATH is /bin:/usr/bin, but that should probably be fixed upstream…

i'm running glibc, both getconf PATH and _CS_PATH also return /bin:/usr/bin

[sulincix]

I think PATH variable defined by _CS_PATH. Or defined by /etc/profile or compile parameter.

I will recreate pull request.