dev-php/hhvm: Add dep on imagemagick

Conflicts:
	dev-php/hhvm/Manifest
	dev-php/hhvm/hhvm-9999.ebuild
dev-php/hhvm: bump boost dep
dev-php/hhvm: Fix building with app-emulation/emul-linux-x86-db

Conflicts:
	dev-php/hhvm/Manifest
	dev-php/hhvm/hhvm-9999.ebuild