[perl #37316] [PATCH] PLATFORMS result with MinGW32

# New Ticket Created by François PERRAD
# Please include the string: [perl #37316]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt.perl.org/rt3/Ticket/Display.html?id=37316 >

This patch updates PLATFORMS for MinGW.

$ parrot -V
This is parrot version 0.2.3-devel (r9282) built for i386-MSWin32.

$ make test

Failed Test Stat Wstat Total Fail Failed List of Failed
-------------------------------------------------------------------------------
t\examples\japh.t 1 256 15 1 6.67% 12
t\pmc\env.t 3 768 12 3 25.00% 6 9-10
t\pmc\timer.t 3 768 8 3 37.50% 4 6-7
(1 subtest UNEXPECTEDLY SUCCEEDED), 3 tests and 90 subtests skipped.
Failed 3/162 test scripts, 98.15% okay. 7/2762 subtests failed, 99.75% okay.

Problem with env.t is related by #37301.
Problem with timer.t is related by #37116.

François Perrad

applied, thanks.