sac2c -h does not list acceptable targets, e.g, mt_pth, etc.

This makes it difficult to find out what targets are acceptable, without spelunking...

This as of:

sac2c -V sac2c 1.3.2-MijasCosta-36-g34023 build-type: RELEASE built-by: "sac" at 2018-09-07T13:43:08

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