Add cxx support (#48) #220

Job	Run time
linux-shared-libs	1m 0s
clang-sanitizers (,thread)	1m 20s
clang-sanitizers (,address,undefined)	1m 24s
linux-compiler-compat (clang-3)	1m 5s
linux-compat (manylinux1-x64)	47s
windows	2m 14s
linux-compiler-compat (clang-6)	1m 18s
linux-compat (manylinux1-x86)	41s
linux-compiler-compat (clang-8)	1m 46s
linux-compat (manylinux2014-x64)	57s
windows-app-verifier	2m 31s
linux-compiler-compat (clang-9)	1m 27s
linux-compat (manylinux2014-x86)	54s
windows-shared-libs	2m 36s
linux-compiler-compat (clang-10)	1m 19s
linux-compat (fedora-34-x64)	52s
linux-compiler-compat (clang-11)	1m 20s
linux-compat (opensuse-leap)	52s
windows-vc14 (x86)	1m 5s
linux-compiler-compat (gcc-4.8)	1m 2s
linux-compat (rhel8-x64)	44s
windows-vc14 (x64)	1m 2s
linux-compiler-compat (gcc-5)	1m 10s
linux-compat (al2-x64)	48s
linux-compiler-compat (gcc-6)	1m 3s
downstream	26m 33s
linux-compiler-compat (gcc-7)	52s
macos	39s
macos-x64	45s
linux-compiler-compat (gcc-8)	1m 2s
	1h 1m 8s

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