Renamed automake variables with upper case suffix like _CFLAGS, but not related
to actual automake object to such a names that they don't cause errors with
automake-ng, which considers such suffices strictly reserved for itself.
In most cases the suffix has just written in lower case.

See patch #4795


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25193 a0f10bec-cc02-0410-94fc-a9cfff90b4cd