add an option to disable brotli tools #493

Job	Run time
Build and test cmake:gcc9	43s
Build and test cmake:clang12	14s
Build and test cmake:clang12:asan	11s
Build and test cmake:clang12:tsan	14s
Build and test cmake:clang12:ubsan	16s
Build and test cmake:qemu-arm-neon-gcc	59s
Build and test cmake-osx:clang	37s
Build and test cmake-osx:gcc	39s
Build and test cmake-win64:msvc2019-rel	1m 7s
Build and test cmake-win64:msvc2019-dbg	1m 8s
Build and test fuzz:clang12	34s
Build and test python39:clang12	12s
Build and test python39-win	32s
Build and test maven	57s
Build and test bazel:root	31s
Build and test bazel:go	39s
Build and test bazel:java	1m 55s
Build and test bazel:js	3m 11s
Build and test bazel:research	20s
Build and test bazel-osx:root	1m 15s
Build and test bazel-osx:go	2m 6s
Build and test bazel-osx:java	3m 48s
Build and test bazel-osx:js	4m 40s
Build and test bazel-osx:research	1m 28s
Build and test bazel-win:root	1m 36s
Build and test bazel-win:java	5m 2s
Build and test bazel-win:research	1m 35s
	36m 29s

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