8035751: Clean up Visual Studio detection logic

8035725: Must keep microsoft VS_PATH on PATH after toolchain detection

8034788: Rewrite toolchain.m4 to support multiple toolchains per platform.

8033292: only warn, not fail, on unknown variables in configure

8031759: Improved tool overriding in configure

8027584: Disable ccache by default

Merge

Merge

Merge

Added tag jdk8u192-b00 for changeset dcfe85bcd901

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