meson: Add Meson build system #1

Job	Run time
run-checker (enable-asan enable-ubsan no-shared no-asm -DOPENSSL_SMALL_FOOTPRINT)	9m 35s
run-checker (no-dgram)	9m 5s
run-checker (no-dso)	4m 17s
run-checker (no-dynamic-engine)	4m 14s
run-checker (no-engine no-shared)	3m 34s
run-checker (no-err)	6m 22s
run-checker (no-filenames)	4m 30s
run-checker (enable-ubsan no-asm -DOPENSSL_SMALL_FOOTPRINT -fno-sanitize=alignment)	10m 58s
run-checker (no-unit-test)	4m 17s
run-checker (enable-weak-ssl-ciphers)	4m 30s
run-checker (enable-zlib)	4m 25s
	1h 5m 47s

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