fix parallelized "jom install"

unlike unix' mkdir -p, windows' md complains if the directory already
exists. the workaround is a quite complex command, so the so far used
concept for assembling the command line from pieces was replaced with a
single template. for symmetry, adapt the makefile existence check to the
new concept as well.

QMAKE_CHK_EXISTS and QMAKE_MKDIR_CMD were added, with hard-coded
fallbacks (ugly).
QMAKE_CHK_FILE_EXISTS and QMAKE_CHK_EXISTS_GLUE (introduced in 5.0.0)
are simply deleted again.
QMAKE_CHK_DIR_EXISTS and QMAKE_MKDIR remain for legacy reasons, as qmake
emits them into the Makefiles, and custom commands may rely on their
presence.

Task-number: QTBUG-28132
Change-Id: I3d049cb5d26947e5c3d102d0c2da33afb2a95140
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Reviewed-by: Janne Anttila <janne.anttila@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

0 files changed, 0 insertions, 0 deletions