[PATCH] replace: Add check for variable program_invocation_short_name

[Martin Schwenke]

It appears that wafsamba's configure() defines _GNU_SOURCE
unconditionally, so checking _GNU_SOURCE isn't enough to know if this
variable is available.

For example, it isn't available on AIX with the xlc compiler:

  [ 6/10] Compiling lib/replace/replace.c
  ...
  "../../lib/replace/replace.c", line 991.16: 1506-045 (S) Undeclared identifier program_invocation_short_name.

Instead, add a configure check for program_invocation_short_name and
use it.


With this fix, the code still compiles on various Linux flavours and
FreeBSD... and once again compiles on AIX with xlc.

Please review and maybe push...

peace & happiness,
martin
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