FreeBSD/src e4a5561 (r350061)sys/netinet/tcp_stacks rack_bbr_common.c

Fix compilation on platforms using gcc.
When compiling RACK on platforms using gcc, a warning that tcp_outflags
is defined but not used is issued and terminates compilation on PPC64,
for example. So don't indicate that tcp_outflags is used.

Reviewed by:            rrs@
Sponsored by:           Netflix, Inc.
Differential Revision:  https://reviews.freebsd.org/D20971
DeltaFile
+0-1sys/netinet/tcp_stacks/rack_bbr_common.c
+0-11 files

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