pgsql: meson: mingw: Allow multiple definitions

meson: mingw: Allow multiple definitions

I didn't carry this forward from the win32 template. It's not needed anymore
for the reason stated therein, but it turns out to be required to
e.g. override getopt. Possibly a better solution exists, but that's for later.

Discussion: /messages/by-id/20220928022724.erzuk5v4ai4b53do@awork3.anarazel.de

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/caeeabd11066a360c8a9986581da320dd5aa09b9

Modified Files
--------------
meson.build | 2 ++
1 file changed, 2 insertions(+)