syncqt: Fix resolution of injected headers for external modules

Injected headers were made relative to MODULE_BASE_OUTDIR by syncqt
and made absolute by resolving against REAL_MODULE_BASE_OUTDIR.
This breaks for modules that reside outside the original Qt source
tree (if the directory depth doesn't coincidentally match).

Now, we resolve injected headers against build_basedir, which is
REAL_MODULE_BASE_OUTDIR. To emphasize the equivalence of
REAL_MODULE_BASE_OUTDIR and syncqt's build_basedir, use the former for
syncqt's -output argument.

This commit amends 2aa779e8.

Fixes: QTBUG-70587
Change-Id: I2935d87d7ee681fa4aa795a270b94ab7a43abe59
Reviewed-by: Dominik Holland <dominik.holland@pelagicore.com>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

0 files changed, 0 insertions, 0 deletions