Prevent msys2 conversion of "cmd /c" switch to a file path

Modern versions of msys2 have changed the treatment of "cmd /c" so that
the runtime will try to convert the switch to a native file path. This
patch adds a setting to inhibit that behaviour.

Discussion: 
https://postgr.es/m/[email protected]

Backpatch to all live branches.

Branch
------
REL9_4_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/3e5cf72f96681fecac88d892978c36c7a834ca02

Modified Files
--------------
contrib/pg_upgrade/test.sh | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

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