Use product-specific standard paths for Qt applications
* configure.ac: Generate qt.conf. * src/Makefile.am (EXTRA_DIST): Remove qt.conf. Add qt.conf.in. * src/nsis/inst-qtbase.nsi: Package generated qt.conf. * src/qt.conf: Rename to... * src/qt.conf.in: ...this.
(cherry picked from commit 41077fc978043d502df3cde92f43756a48b6160d)
- GnuPG-bug-id: T7717