build

dependencies vendoring, part 1 #5783

Job	Run time
macos/clang++/c++17	7m 18s
macos/clang++/c++17	7m 18s
macos/clang++/c++17	7m 18s
buster/g++/c++17/asan=off/ubsan=off	10m 40s
buster/g++/c++17/asan=off/ubsan=off	22m 34s
buster/g++/c++17/asan=off/ubsan=off	22m 34s
focal/clang++/c++17/asan=off/ubsan=on	10m 39s
focal/clang++/c++17/asan=off/ubsan=on	10m 39s
focal/clang++/c++17/asan=off/ubsan=on	1s
focal/g++-10/c++20/asan=on/ubsan=off	10m 39s
focal/g++-10/c++20/asan=on/ubsan=off	10m 39s
focal/g++-10/c++20/asan=on/ubsan=off	10m 39s
jammy/g++/c++20/asan=on/ubsan=off	10m 23s
jammy/g++/c++20/asan=on/ubsan=off	10m 23s
jammy/g++/c++20/asan=on/ubsan=off	10m 23s
	2h 42m 7s

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