macOS: prefer homebrew openssl 1.1.x over 1.0.x, see #839
macOS: prefer homebrew openssl 1.1.x over 1.0.x, see #839

previously, it was not possibly to compile a python with homebrew
openssl 1.1 because the code always queried "openssl" and ignored
"openssl@1.1".

now, if 1.1 is installed, it is used to compile python and only
if it is not, 1.0 is checked and used.

sebhahn/pyenv,yyuu/pyenv,sebhahn/pyenv,sebhahn/pyenv,pyenv/pyenv,pyenv/pyenv,yyuu/pyenv,pyenv/pyenv