cgpt PKGBUILD

Here is the cgpt PKGBUILD for consideration / changes.  

It uses the logic from the latest linux-chromebook I did (which is to say it pulls a snapshot from the ChromeOS sources, untars it and goes to work).  

The disable-static linking patch is from Fedora's vboot package, however I believe I could regenerate that if needed.  Otherwise the build fails with a -luuid reference.  

The binary is installed in /usr/sbin and it shows cgpt partitions and was good enough partition a usb key to make a bootable install.