Build statically linked binaries in makefile; remove make clean

[janetkuo]

Fixes #98

Now make binary, make all or make default gives me statically linked binaries:

$ ldd bundles/kompose_linux-amd64/kompose 
    not a dynamic executable
$ file bundles/kompose_linux-amd64/kompose 
bundles/kompose_linux-amd64/kompose: ELF 64-bit LSB  executable, x86-64, version 1 (SYSV), statically linked, not stripped

Also removed make clean since the clean script doesn't exist.

[ngtuna]

+1 @janetkuo .

[pradeepto]

@janetkuo @ngtuna But we should have a clean directive, I think. Not sure how it works in Goland but, it definitely made a lot of sense in C/C++ world. We probably want something to make sure we have a pristine build. What do you all think?

[janetkuo]

@pradeepto Yes we should support make clean, and we can add it back once we have the clean script