Revert "[SV 56449] (Windows) Use slow path if '%' appears in the command"

This reverts commit 38e96eadea6e2cd42a0f414959bac327de9f468a.
Per discussion on Savannah, the modified behavior matches
the way % is handled in batch files, but not in cmd command
lines.  And since Make mostly tries to emulate the command
line, the new behavior is unexpected and backward-incompatible.
1 file changed