Allow treating /_virtual_includes/ and bazel-out/ as -isystem#53

lalten wants to merge 2 commits intoerenon:mastererenon/bazel_clang_tidy:masterfrom

lalten:virtual-and-generated-includes-as-isystemlalten/bazel_clang_tidy:virtual-and-generated-includes-as-isystemCopy head branch name to clipboard