CMake

Bump third_party/libsbp from `84f224f` to `1bfe255` #686

Job	Run time
build_using_compiler_in_environment (clang, clang++)	1m 44s
build_using_compiler_in_environment (gcc, g++)	1m 29s
install	1m 28s
linters (cppcheck)	2m 41s
linters (clang-tidy)	3m 55s
test (clang-sanitize-address)	1m 59s
test (clang-sanitize-undefined)	1m 59s
coverage	1m 55s
	17m 10s

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