Corrected qt5.m4 to use FC_QT5_COMPILETEST

See bug #21794


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24684 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Default AI does not try to check if ally plans to declare war on its behalf.
That was working only when the ally had exactly same AI type, and was not an
human player. Otherwise it worked on incorrect data.

See bug #21630


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24686 a0f10bec-cc02-0410-94fc-a9cfff90b4cd