[bug #43936] Completion of error handling

[Paul D. Smith]

Follow-up Comment #1, bug #43936 (project make):

putchar and puts are not handled purposefully: at the very end when make exits
it will verify that there is no error with stdout.  See the close_stdout()
function in output.c file  and the long comment before that: this is a
standard method of handling these errors in GNU programs.

For sigaction, it's actually not really possible for it to fail given the way
it's called.  However I can add a check anyway; it won't hurt.

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