FreeBSD/ports 2460b9c (r512512)games/starfighter Makefile

games/starfighter: fix build on GCC architectures

Set USE_CSTD=c99 to fix build issue when using base GCC:
gfx.c:922: error: 'for' loop initial declaration used outside C99 mode

PR:             240691
Approved by:    portmgr (blanket: build fix), linimon (mentor)
Differential Revision:  https://reviews.freebsd.org/D21722
DeltaFile
+1-0games/starfighter/Makefile
+1-01 files

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