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Gn check can enforce dependencies only if the header is included with
an absolute path (from the root of the project) or if "include_dirs"
is used. It ignores -isystem and -imsvc since they are part of
cflags (and similar variants).

Since //third_party/abseil-cpp/absl:absl_include_config was using
-isystem and -imsvc only to sidestep compiler warnings in absl code,
it is good to try to switch back to include_dirs instead of adding
-isystem/-imsvc support to "gn check".

Bug: 862521
Change-Id: I9c2d01abad75023918a88f852e3080486dcafead
Reviewed-on: https://chromium-review.googlesource.com/1124478
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577535}