Treat MINGW and MSYS the same in pg_upgrade test script
On msys2, 'uname -s' reports a string starting MSYS instead on MINGW
as happens on msys1. Treat these both the same way. This reverts
608a710195a4b in favor of a more general solution.
Backpatch to all live branches.
Branch
------
REL9_5_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/33066b0142893ead9b1bd9709552a9f173ffddb3
Modified Files
--------------
src/bin/pg_upgrade/test.sh | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)