In developer builds we don't install tools, so syncqt executable is
located in its RUNTIME_OUTPUT_DIRECTORY but not by install path. This
works fine in general case, but in multi-config builds the
RUNTIME_OUTPUT_DIRECTORY path doesn't match the install path. So syncqt
target points to wrong location in this case. It makes sense to use the
existing IMPORTED_LOCATION of syncqt executable directly if Qt is not
supposed to be installed. Also check if the syncqt executable exists at
the expected location before creating the imported target.
Pick-to: 6.5
Fixes: QTBUG-109864
Change-Id: I0de647b2a73169a0d48bd88edeb7ff00975fa774
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
2bf54da75a