Intel compiler needs custom archiver

[John Maddock]

The Intel C++ compiler should have static libraries built with xiar not ar on Linux, probably on OSX as well but I don't know about that for sure. Without this static libraries built with -ipo (inter procedural optimizations) are non-usable. I'm attaching a partial patch for this, but note that:

• It's only a partial solution since the Intel setup script isn't called before calling xiar - I couldn't figure out how to achieve that.
• Compiled executables often don't run - again the Intel setup script needs to be run before the executable so that Intel's shared libraries can be found. One workaround would be to always link with the -static-intel flag.