syslinux: drop 6.03_pre9, switch to 4.07 for ISOs

SYSLINUX is only used for creating ISO images these days so we no longer
need the 6.xx series with UEFI support. Once we get to adding UEFI
support to our images we should perhaps use GRUB to consolidate things.

This is prompted by a report that booting our ISOs hang on some Dell
servers but the older version works.

sdk_container/src/third_party/coreos-overlay/sys-boot/syslinux/Manifest

@@ -1,2 +1 @@
 DIST syslinux-4.07.tar.bz2 5761877 SHA256 1240a4e4219b518bdaef78931b6e901befeff35e6894ac6db785115848a7a05a SHA512 8efbd14803ec74c5ee699a754b4727e4b975c08afd4dbb39f4b7ccdb90743e4459cd4609c6f1065c7b7efaa26c9d465806254891795d363758f35a2fe5704ae5 WHIRLPOOL b68966ed87055a157812f36f2881b4a86797eacef1894b70c1a063327547264daa4b4ca1ea52ccb286ab86332c2163e57004d3503215497278e073b48583a9dc
-DIST syslinux-6.03-pre9.tar.xz 6820056 SHA256 adeda4dfbaf0e7604561d59d73f5f156d398f87411ca5f56f56fe15675f3e3b0 SHA512 9b3d14c496a5fe8fa446d1ce265e17508334b1cdae4443c6965861b6dcccb96099b9c97e492761af19732cb5dcabd0ad6642119a6defd0e18e072a0a752278d8 WHIRLPOOL 3a5a21927c3c00399c7ff8d64346c29706a0f0060c9ec05d38140529108b59bdb7ef1e83bd24afd9cbb80eb8b0d00185004c403e84e70fe7a8c0077e09d886b5

sdk_container/src/third_party/coreos-overlay/sys-boot/syslinux/syslinux-6.03_pre9.ebuild

@@ -1,84 +0,0 @@
-# Copyright 1999-2014 Gentoo Foundation
-# Distributed under the terms of the GNU General Public License v2
-# $Header: /var/cvsroot/gentoo-x86/sys-boot/syslinux/syslinux-6.03_pre1.ebuild,v 1.2 2014/02/09 18:04:43 zerochaos Exp $
-
-EAPI=5
-
-inherit eutils toolchain-funcs
-
-DESCRIPTION="SYSLINUX, PXELINUX, ISOLINUX, EXTLINUX and MEMDISK bootloaders"
-HOMEPAGE="http://www.syslinux.org/"
-SRC_URI="mirror://kernel/linux/utils/boot/syslinux/Testing/${PV:0:4}/${P/_/-}.tar.xz"
-
-LICENSE="GPL-2"
-SLOT="0"
-KEYWORDS="-* amd64 x86"
-IUSE="custom-cflags +perl"
-
-RDEPEND="sys-apps/util-linux
-		sys-fs/mtools
-		perl? (
-			dev-lang/perl
-			dev-perl/Crypt-PasswdMD5
-			dev-perl/Digest-SHA1
-		)"
-DEPEND="${RDEPEND}
-	dev-lang/nasm
-	virtual/os-headers"
-
-S=${WORKDIR}/${P/_/-}
-
-QA_PREBUILT="usr/share/${PN}/*.c32"
-
-src_prepare() {
-	# Don't prestrip or override user LDFLAGS, bug #305783
-	local SYSLINUX_MAKEFILES="extlinux/Makefile linux/Makefile mtools/Makefile \
-		sample/Makefile utils/Makefile"
-	sed -i ${SYSLINUX_MAKEFILES} -e '/^LDFLAGS/d' || die "sed failed"
-
-	if use custom-cflags; then
-		sed -i ${SYSLINUX_MAKEFILES} \
-			-e 's|-g -Os||g' \
-			-e 's|-Os||g' \
-			-e 's|CFLAGS[[:space:]]\+=|CFLAGS +=|g' \
-			|| die "sed custom-cflags failed"
-	else
-		QA_FLAGS_IGNORED="
-			/sbin/extlinux
-			/usr/bin/memdiskfind
-			/usr/bin/gethostip
-			/usr/bin/isohybrid
-			/usr/bin/syslinux
-			"
-	fi
-	case ${ARCH} in
-		amd64)	loaderarch="efi64" ;;
-		x86)	loaderarch="efi32" ;;
-		*)	ewarn "Unsupported architecture, building installers only." ;;
-	esac
-
-	# Don't build/install scripts if perl is disabled
-	if ! use perl; then
-		sed -i utils/Makefile \
-			-e 's/$(TARGETS)/$(C_TARGETS)/' \
-			-e 's/$(ASIS)//' \
-			|| die "sed remove perl failed"
-		rm man/{lss16toppm.1,ppmtolss16.1,syslinux2ansi.1} || die
-	fi
-}
-
-src_compile() {
-	# build system abuses the LDFLAGS variable to pass arguments to ld
-	unset LDFLAGS
-	if [[ ! -z ${loaderarch} ]]; then
-		emake CC=$(tc-getCC) LD=$(tc-getLD) ${loaderarch}
-	fi
-	emake CC=$(tc-getCC) LD=$(tc-getLD) ${loaderarch} installer
-}
-
-src_install() {
-	# parallel install fails sometimes
-	einfo "loaderarch=${loaderarch}"
-	emake -j1 LD=$(tc-getLD) INSTALLROOT="${D}" MANDIR=/usr/share/man bios ${loaderarch} install
-	dodoc README NEWS doc/*.txt
-}