[Bug libobjc/63765] [5.0 Regression] libobjc testsuite failures on AIX caused by setting _XOPEN_SOURCE

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63765

--- Comment #16 from David Edelsohn <dje at gcc dot gnu.org> ---
The alternative patch works on AIX.  I thought that it was going to be
installed.