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DLOPEN_KERBEROS is a flag used to control whether the GSSAPI library
should be loaded at runtime (via dlopen()) or linked to statically. The
latter is used by some Linux distributions. Unfortunately this flag was
not being passed to the net_unittests target, which resulted in the
corresponding tests to not be compiled all these years.

This CL moves DLOPEN_KERBEROS from being a compiler flag to being a
buildflag in net_buildflag.h. This increases the visibility of
DLOPEN_KERBEROS substantially, but is consistent with its sibling
USE_KERBEROS.

Ideally this buildflag should be called DLOPEN_GSSAPI which will happen
after an announcement on net-dev@.

Bug: 927182
Change-Id: I6d886595fcebabb222436113ea60f8879e08910d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1639345
Commit-Queue: Asanka Herath <asanka@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665799}