Any interest in Golang patchset for better ARCH flags?

[Daniel Santos]

Hello Jeffery,

Thank you for the wonderful work on maintaining the Go packages!

I got a little irritated at CGo's restriction of arch flags (in the
immutable GOGCCFLAGS variable) and put together a patch set for v19.07
to override them with an environment variable and then (optionally) feed
the machine flags in the Golang build.  In the OpenWRT repo, I did this
by splitting out how DEFAULT_CFLAGS are put together in order to
populate a DEFAULT_MACHINE_FLAGS, but it could probably be done with
just a $(filter -m%,$(DEFAULT_CFLAGS)) instead.

If you or others have any interest in this, I can clean them up for the
master branch.  I'm probably going to submit the Golang patch upstream,
since I don't see any good reason for such a restriction.  I see you've
made a lot of changes on the HEAD.

Daniel
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