Convert some GN test support targets to static libs.

Converts some source sets that were source sets into static libraries. Converts additional targets in the touched files to static libraries where it seemed relevant.

Update the definition of //crypto:test_support to mark it testonly and make the conditions append sources rather than subtract them in the reverse condition.

A few redundant dependencies were removed (one shouldn't need to specify both "foo" and "foo:test_support").

BUG=627637
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_blink_rel

Review-Url: https://codereview.chromium.org/2151653003
Cr-Commit-Position: refs/heads/master@{#405544}

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