Turning off pkg-config with the configure flag -no-pkg-config did not
work. There are different defaults for FEATURE_pkg_config on different
platforms (e.g. Linux: ON, Windows: OFF). The existing code that
calculated the initial FEATURE_pkg_config value assumed that the default
is OFF and never turned the feature off.
Fixes: QTBUG-104123
Change-Id: I33b9687c55c60d4ec9224324951a8838741ee976
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
(cherry picked from commit 4cef4f1c1be713e932052968ac853ec37750ae61)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
9672067374