add an option to disable brotli tools #491

Job	Run time
Build and test cmake:gcc9	26s
Build and test cmake:clang12	9s
Build and test cmake:clang12:asan	16s
Build and test cmake:clang12:tsan	17s
Build and test cmake:clang12:ubsan	9s
Build and test cmake:qemu-arm-neon-gcc	1m 12s
Build and test cmake-osx:clang	38s
Build and test cmake-osx:gcc	38s
Build and test cmake-win64:msvc2019-rel	1m 31s
Build and test cmake-win64:msvc2019-dbg	1m 12s
Build and test fuzz:clang12	31s
Build and test python39:clang12	10s
Build and test python39-win	1m 3s
Build and test maven	30s
Build and test bazel:root	27s
Build and test bazel:go	36s
Build and test bazel:java	1m 53s
Build and test bazel:js	3m 21s
Build and test bazel:research	45s
Build and test bazel-osx:root	1m 40s
Build and test bazel-osx:go	2m 26s
Build and test bazel-osx:java	5m 20s
Build and test bazel-osx:js	6m 57s
Build and test bazel-osx:research	1m 41s
Build and test bazel-win:root	1m 41s
Build and test bazel-win:java	7m 39s
Build and test bazel-win:research	1m 39s
	44m 47s

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