[sr #110362] STRERROR_R_CHAR_P broken by 326c9a547423d25c621bc5c0ef76edbf6eda8c92

Update of sr #110362 (project autoconf):

                  Status:                    None => Done                   
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #1:

Fixed in c8b3f6987a7bbfe15ce2c2f04f308a6abc263d04.

Annoyingly, the test suite cannot detect this; we'd have to have a database of
expected *results* for the tests, which we don't, and we'd have to run the
test suite on an OS where strerror_r actually does return `char *`.  It
doesn't help that AC_COMPILE_IFELSE has no concept of "this compilation
failed, but not for the reason we think it might fail."

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