[bug #56449] job.c (construct_command_argv_internal): Must use shell if '%' character is present in recipe line

[Christian Eggers]

Follow-up Comment #12, bug #56449 (project make):

[comment #10 comment #10:]
> GNU Make emulates the behavior of the shell as if the user typed the
commands at the shell's prompt.  It is true that you need to double the %
characters in batch files, but GNU Make doesn't behave like batch files do.
> 
> So I think this change is for the worse, and should be reverted.

Ack. If I remember correctly, the double % were caused by cmake (unfortunately
I cannot verify this in short term). Maybe cmake expects that for MingW
Makefiles it needs to convert a single % into a double one. If this is wrong,
this behavior should changed in cmake.

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