qtbase: Restrict 'tests' build to distros with 'ptest' support
qtbase: Restrict 'tests' build to distros with 'ptest' support

Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

meta-qt5/meta-qt5,schnitzeltony/meta-qt5,meta-qt5/meta-qt5,schnitzeltony/meta-qt5