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(parent: 9c7dd35) | patch

Fix Perl coding error in msvc build system

Fix Perl coding error in msvc build system

Code like

open(P, "cl /? 2>&1 |") || die "cl command not found";

does not actually catch any errors, because the exit status of the
command before the pipe is ignored. The fix is to look at $?.

This also gave the opportunity to clean up the logic of this code a bit.

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