Merge pull request #253 from ngtcp2/qpack-buf-reserve #740

Job	Run time
build (ubuntu-22.04, gcc, autotools)	49s
build-cross (x86_64-w64-mingw32)	1m 20s
build (ubuntu-22.04, gcc, cmake)	53s
build-windows (x86)	48s
build-cross (i686-w64-mingw32)	1m 9s
build (ubuntu-22.04, clang, autotools)	54s
build-windows (x64)	1m 24s
build (ubuntu-22.04, clang, distcheck)	55s
build (ubuntu-22.04, clang, cmake)	53s
build (macos-13, gcc, autotools)	2m 16s
build (macos-13, gcc, cmake)	1m 25s
build (macos-13, clang, autotools)	1m 9s
build (macos-13, clang, distcheck)	1m 29s
build (macos-13, clang, cmake)	1m 59s
build (macos-14, gcc, autotools)	45s
build (macos-14, gcc, cmake)	43s
build (macos-14, clang, autotools)	40s
build (macos-14, clang, distcheck)	55s
build (macos-14, clang, cmake)	39s
release	0s
	21m 5s

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