zos: use custom proctitle implementation

ZOSLIB uses `argv[0]` to determine the exepath. So it is necessary to
use an implementation of proctitle that does not modify `argv[0]`. Since

zos: use custom proctitle implementation

ZOSLIB uses `argv[0]` to determine the exepath. So it is necessary to
use an implementation of proctitle that does not modify `argv[0]`. Since
there is currently no support for process titles on z/OS, the custom
proctitle implementation simply stores the desired title in memory.

This resolves failure in tests `get_currentexe` and `process_title` on
z/OS.

PR-URL: https://github.com/libuv/libuv/pull/3060
Reviewed-By: Richard Lau <rlau@redhat.com>

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