openrc: avoid unnecessary malloc inside sig-handler

malloc (called by xasprintf) is not async-signal-safe. beside, the
string here is constant, so there's no need to malloc it all.

eerrorx isn't async-signal-safe either (due to calling fprintf and exit)
but consequence of them are _typically_ not as grave as calling malloc
while it's internal state is inconsistent.

Bug: https://github.com/OpenRC/openrc/issues/589

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