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Several configs in the Linux GN build are used in only one place.
Defining these configs in build/config/linux/BUILD.gn makes them
get resolved on all Linux-derived platforms, during both target
builds and host-tool builds. This doesn't work on CrOS, which
does not need or want the packages references by these configs.

gconf is used in multiple places, so moving the config won't work.
Instead, the gconf config is only resolved when building for
a Linux target.

BUG=None
TEST=GN build for Linux and CrOS
R=jamesr

Review URL: https://codereview.chromium.org/655343002

Cr-Commit-Position: refs/heads/master@{#299903}