Add support for bash-static

[Aurora Lanes]

I'm unable to compile scripts with the #!/bin/bash-static shebang.
bash-static is simply a static version of Bash.

[Hafiz]

U can use
export CFLAGS="-static"
./shc ..

[Paul Lee]

I wrote an alternate tool, use pipes and support shebang.

https://github.com/liberize/sshc