TeX Live and LyX; Changes to the boot code

Another update is better support for installing to GPT partitions. This includes changes to makebootable, writembr, and the anyboot images as of hrev49242. These changes will allow you to install and boot Haiku on a GPT partitioned disk without any hacks or workarounds (e.g. no need for icky hybrid MBRs).

Many thanks goes out to Anarchos, who did the initial work on a TeX Live recipe; and also to Adrien and Ingo who helped me figure out all my issues with my Jamfiles!