games/flightgear: disable the ninja generator
- with ninja 1.9 duplicate targets are errors [1]
- disable ninja until the issue [2] is fixed upstream.
[1] https://github.com/ninja-build/ninja/commit/42eefc854b32b3c1efc27548baaacdebad199853
[2] https://sourceforge.net/p/flightgear/codetickets/2118/
PR: 235507
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head/games/flightgear/Makefile