git: 269b7d8ac1e5 - stable/12 - tftpd: tests: raise targeted cstd to c11

[Mark Linimon]

On Wed, Dec 30, 2020 at 09:43:50AM -0800, John Baldwin wrote:
> Just to be explicit, we do not care about building amd64 with 4.2.1 at this
> point on 12.x.

AFAIK the only use case for gcc4.2.1 is powerpc* < 13.  (I check new
ports on powerpc64 vs. gcc4.2.1.  I will be glad to see the end of it.)

mcl