build

Allow zero-length reads (#193) #156

Job	Run time
macos (aarch64, 11, MacOSX11.0.sdk)	59s
macos (x86_64, 10.9, MacOSX10.9.sdk)	31s
windows (x86_64)	1m 16s
windows (aarch64)	2m 58s
ubuntu (x86, g++-multilib)	1m 48s
ubuntu (x86_64, g++-)	49s
ubuntu (ppc64, g++-powerpc64le-linux-gnu)	2m 21s
ubuntu (armhf, g++-arm-linux-gnueabihf)	32s
ubuntu (riscv64, g++-riscv64-linux-gnu)	34s
ubuntu (aarch64, g++-aarch64-linux-gnu)	40s
ubuntu (mingwaarch64, clang)	1m 4s
ubuntu (mingw64, g++-mingw-w64-x86-64)	4m 31s
ubuntu (mingw32, g++-mingw-w64-i686)	38s
	18m 41s

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