dev-util/dwarves: update to 1.19 for CONFIG_DEBUG_INFO_BTF

It is already possible to enable kernel config `CONFIG_DEBUG_INFO_BTF`
using dwarves 1.18 included in the current Flatcar SDK, as long as its
arch is amd64.

However, Kernel build fails in case of arm64, when Kernel version is
>= 5.9 and dwarves version is <= 1.18, like the following:

```
+ pahole -J .tmp_vmlinux.btf
PAHOLE: Error: Found symbol of zero size when encoding btf
(sym: '__kvm_nvhe_arm64_ssbd_callback_required', cu: '../source/arch/arm64/kernel/cpu_errata.c').
PAHOLE: Error: Use '-j' or '--force' to ignore such symbols and force emit the btf.
../source/scripts/link-vmlinux.sh: line 141: 1929102 Segmentation fault
```

The bug was fixed via
https://git.kernel.org/pub/scm/devel/pahole/pahole.git/commit/?id=2e719cca6672,
("btf_encoder: revamp how per-CPU variables are encoded").
The fix was first included in dwarves
[1.19](https://git.kernel.org/pub/scm/devel/pahole/pahole.git/tag/?h=v1.19).
Thus we need to get dwarves 1.19 included in Flatcar SDK, so that the
next Alpha Kernels could have `CONFIG_DEBUG_INFO_BTF` enabled.

sdk_container/src/third_party/portage-stable/dev-util/dwarves/Manifest

@@ -1,2 +1,3 @@
 DIST dwarves-1.17.tar.xz 309028 BLAKE2B 600d095359fa1ef208cc83655761505a07512faf9957144cc5fdd9e69bef98be3afc8b29a4c13aa0246aa43fdc9b4906de95f37c86fc6790ece52a79e3b13695 SHA512 8916ea24316efe1eb322d045fb2d81c230905f2fe33942eac641e9e0311f33a3bcf55be454eac32781799c255303bafacd8f1bd1b3ec08f0dae4d5f38d8186ba
 DIST dwarves-1.18.tar.xz 324912 BLAKE2B bdce2903608a1229e2fc7e8a01bc41249a17a1a003fc3616910959fc43b430569cd737a220edfab2473485cd2dc0519b4add0e0e3a690e51ad35c4fa082752a5 SHA512 01647607ce0f4dfceb464367f2dd8a432f33eb5d0e003b6bbb07b38bd992a2992844309b04aee2a0388658c41d8b2059d03064c6e450fe7c347c5bca445d7938
+DIST dwarves-1.19.tar.xz 686136 BLAKE2B f7fe50be30fa9b247bf0f35d5dec6aa8f1bed44eaaf8a2cde8da6f65a870212c2d257740a6d4f94da24f365ad49259d53c4f5447921b22754c63184001029620 SHA512 b378a504da5b00c6280b9efda7348c2d61015ce6477f3e4e4466f58d9bf6837457cd0aa9263b7d921093cca5ee26c4fab9950f7f75ca05d27ae646b3bfe22f9a

sdk_container/src/third_party/portage-stable/dev-util/dwarves/dwarves-1.19.ebuild

@@ -0,0 +1,44 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_{6,7} )
+inherit multilib cmake python-single-r1
+
+DESCRIPTION="pahole (Poke-a-Hole) and other DWARF2 utilities"
+HOMEPAGE="https://git.kernel.org/cgit/devel/pahole/pahole.git/"
+
+LICENSE="GPL-2" # only
+SLOT="0"
+KEYWORDS="~amd64 ~ppc64 ~x86"
+IUSE="debug"
+REQUIRED_USE="${PYTHON_REQUIRED_USE}"
+
+RDEPEND="${PYTHON_DEPS}
+	>=dev-libs/elfutils-0.178
+	sys-libs/zlib"
+DEPEND="${RDEPEND}"
+
+if [[ ${PV//_p} == ${PV} ]]; then
+	SRC_URI="http://fedorapeople.org/~acme/dwarves/${P}.tar.xz"
+else
+	SRC_URI="https://dev.gentoo.org/~zzam/${PN}/${P}.tar.xz"
+fi
+
+DOCS=( README README.ctracer NEWS )
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-1.10-python-import.patch
+)
+
+src_configure() {
+	local mycmakeargs=( "-D__LIB=$(get_libdir)" )
+	cmake_src_configure
+}
+
+src_test() { :; }
+
+src_install() {
+	cmake_src_install
+}