Compile Openssl for mac os x

编译环境：mac os x 10.15.3 ，openssl-OpenSSL_1_0_2u

生成的是.a静态库

编译命令：

./Configure darwin64-x86_64-cc --prefix=/Users/gezhaoyou/Downloads/openssl-OpenSSL_1_0_2u/output
make && make install

--prefix= 指定编译输出路径

参考：https://wiki.openssl.org/index.php/Compilation_and_Installation