Merge pull request #260 from ngtcp2/ispow2 #759

Job	Run time
build-cross (x86_64-w64-mingw32)	2m 11s
build-cross (i686-w64-mingw32)	2m 18s
build-windows (x86)	1m 20s
build (ubuntu-22.04, gcc, autotools)	1m 5s
build-windows (x64)	1m 27s
build (ubuntu-22.04, gcc, cmake)	45s
build (ubuntu-22.04, clang, autotools)	42s
build (ubuntu-22.04, clang, distcheck)	56s
build (ubuntu-22.04, clang, cmake)	55s
build (macos-13, gcc, autotools)	1m 28s
build (macos-13, gcc, cmake)	1m 14s
build (macos-13, clang, autotools)	1m 18s
build (macos-13, clang, distcheck)	1m 56s
build (macos-13, clang, cmake)	1m 22s
build (macos-14, gcc, autotools)	41s
build (macos-14, gcc, cmake)	46s
build (macos-14, clang, autotools)	41s
build (macos-14, clang, distcheck)	59s
build (macos-14, clang, cmake)	42s
release	0s
	22m 46s

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