FreeBSD/ports 70de6f4 (r512507)audio/fasttracker2 Makefile

audio/fasttracker2: fix build with base GCC

Add USE_CSTD=c99 to fix build with base GCC:
/wrkdirs/usr/ports/audio/fasttracker2/work/ft2-clone-code/src/ft2_gui.c:431: error: 'for' loop initial declaration used outside C99 mode

PR:             240659
Approved by:    ehaupt (maintainer), linimon (mentor)
Differential Revision:  https://reviews.freebsd.org/D21702
DeltaFile
+1-0audio/fasttracker2/Makefile
+1-01 files

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