CMake

avoid need for char16_t #143

Job	Run time
build-osx (macos-m1, Release)	2m 44s
build-dockcross (manylinux1-x64, Release)	49s
build-osx (macos-m1, Debug)	2m 14s
build-dockcross (manylinux1-x64, Debug)	43s
build-osx (macos-12, Release)	4m 19s
build-dockcross (manylinux1-x86, Release)	50s
build-osx (macos-12, Debug)	3m 39s
build-dockcross (manylinux1-x86, Debug)	44s
build-osx (macos-14, Release)	1m 36s
build-dockcross (manylinux2014-x64, Release)	1m 14s
build-osx (macos-14, Debug)	1m 46s
build-dockcross (manylinux2014-x64, Debug)	1m 20s
build-dockcross (manylinux2014-x86, Release)	1m 14s
build-dockcross (manylinux2014-x86, Debug)	1m 19s
build-dockcross (manylinux2014-aarch64, Release)	2m 23s
build-dockcross (manylinux2014-aarch64, Debug)	2m 17s
build-dockcross (windows-shared-x64-posix, Release)	2m 2s
build-dockcross (windows-shared-x64-posix, Debug)	1m 54s
build-dockcross (linux-armv7-lts, Release)	58s
build-dockcross (linux-armv7-lts, Debug)	57s
	35m 2s

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