[Windows MSVC CFG] Turning on linker CFG for all.  Disabling CFG compile.

This enables support for CFG that is already compiled into Microsoft
system DLLs - in any of our processes.

Also disabling compilation of CFG with MSVC compiler.  Preparing for
clang CFI instead.

TEST=CFGSupportTests.MsIndirectFailure in sbox_integration_tests suite.
BUG=584575
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win10_chromium_x64_rel_ng
TBR=thestig or jochen (chrome\BUILD.gn)

Review-Url: https://codereview.chromium.org/2693193005
Cr-Commit-Position: refs/heads/master@{#451116}
5 files changed