Add xargs max-args

`xargs: git : Bad file number` error is shown while openssl build
due to large size of fileList.txt.
We add max-args option to limit arguments per command line.
OpenSSL: add -s link option to reduce the size of executable

This reduced the size of opessl.exe from 1M to 451k.
Merge pull request #224 from shirosaki/openssl_msys

OpenSSL: add -s link option to reduce the size of executable