Default symbol visibility to hidden in static libs too #213

Job	Run time
downstream	1m 28s
clang-sanitizers (,thread)	1m 25s
linux-compat (manylinux1-x64)	42s
clang-sanitizers (,address,undefined)	1m 25s
linux-compat (manylinux1-x86)	36s
linux-compat (manylinux2014-x64)	52s
linux-compiler-compat (clang-3)	1m 4s
linux-shared-libs	52s
linux-compat (manylinux2014-x86)	40s
macos	9s
linux-compiler-compat (clang-6)	1m 6s
linux-compat (fedora-34-x64)	38s
linux-compiler-compat (clang-8)	1m 6s
linux-compat (opensuse-leap)	33s
linux-compiler-compat (clang-9)	1m 5s
macos-x64	15s
linux-compat (rhel8-x64)	23s
windows	35s
linux-compiler-compat (clang-10)	1m 4s
linux-compat (al2-x64)	34s
linux-compiler-compat (clang-11)	1m 5s
windows-app-verifier	21s
windows-shared-libs	35s
linux-compiler-compat (gcc-4.8)	59s
linux-compiler-compat (gcc-5)	55s
windows-vc14 (x86)	47s
linux-compiler-compat (gcc-6)	1m 3s
windows-vc14 (x64)	43s
linux-compiler-compat (gcc-7)	50s
linux-compiler-compat (gcc-8)	1m 3s
	24m 53s

Provide feedback