Removed DuetPkg from update.sh
Fixes commit 4562
tools_def.txt: the path to the mtoc binary is now adjustable via variable (MTOC_PREFIX)
ebuild.sh: Reverted commit r4404
ebuild.sh: The right fix for r4402-r4403
ebuild.sh: fixed bad commit r4402
ebuild.sh: restored OsxFatBinaryDrv-64.efi as mandatory driver for UEFI boot
ebuild.sh: Fixed problem when /usr/local/bin may contain actual mtoc.NEW binary and not a symlink to it.