systemd: upgrade 255.18 -> 255.21

The update includes 79 commits. Full list of changes can be found on
Github [1]

All patches were refreshed with devtool.

[1] https://github.com/systemd/systemd-stable/compare/v255.18...v255.21

(From OE-Core rev: 29e623b2ad00555788412fa520fbb9ffec794cbb)

Signed-off-by: Guðni Már Gilbert <gudni.m.g@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-core/systemd/systemd-boot_255.21.bb

@@ -0,0 +1,67 @@
+require systemd.inc
+FILESEXTRAPATHS =. "${FILE_DIRNAME}/systemd:"
+
+require conf/image-uefi.conf
+
+DEPENDS = "libcap util-linux gperf-native python3-jinja2-native python3-pyelftools-native"
+
+inherit meson pkgconfig gettext
+inherit deploy
+
+LDFLAGS:prepend = "${@ " ".join(d.getVar('LD').split()[1:])} "
+
+EFI_LD = "bfd"
+LDFLAGS:append = " -fuse-ld=${EFI_LD}"
+
+do_write_config[vardeps] += "EFI_LD"
+do_write_config:append() {
+    cat >${WORKDIR}/meson-${PN}.cross <<EOF
+[binaries]
+c_ld = ${@meson_array('EFI_LD', d)}
+EOF
+}
+
+MESON_CROSS_FILE:append = " --cross-file ${WORKDIR}/meson-${PN}.cross"
+
+MESON_TARGET = "systemd-boot"
+
+EXTRA_OEMESON += "-Defi=true \
+                  -Dbootloader=true \
+                  -Dman=false \
+                  "
+
+# install to the image as boot*.efi if its the EFI_PROVIDER,
+# otherwise install as the full name.
+# This allows multiple bootloaders to coexist in a single image.
+python __anonymous () {
+    import re
+    target = d.getVar('TARGET_ARCH')
+    prefix = "" if d.getVar('EFI_PROVIDER') == "systemd-boot" else "systemd-"
+    systemdimage = prefix + d.getVar("EFI_BOOT_IMAGE")
+    d.setVar("SYSTEMD_BOOT_IMAGE", systemdimage)
+    prefix = "systemd-" if prefix == "" else ""
+    d.setVar("SYSTEMD_BOOT_IMAGE_PREFIX", prefix)
+}
+
+FILES:${PN} = "${EFI_FILES_PATH}/${SYSTEMD_BOOT_IMAGE}"
+
+RDEPENDS:${PN} += "virtual-systemd-bootconf"
+
+CFLAGS:append:libc-musl = " -D__DEFINED_wchar_t"
+
+COMPATIBLE_HOST = "(aarch64.*|arm.*|x86_64.*|i.86.*)-linux"
+COMPATIBLE_HOST:x86-x32 = "null"
+
+do_install() {
+	install -d ${D}${EFI_FILES_PATH}
+	install ${B}/src/boot/efi/systemd-boot*.efi ${D}${EFI_FILES_PATH}/${SYSTEMD_BOOT_IMAGE}
+}
+
+do_deploy () {
+	install ${B}/src/boot/efi/systemd-boot*.efi ${DEPLOYDIR}
+	install ${B}/src/boot/efi/linux*.efi.stub ${DEPLOYDIR}
+	install ${B}/src/boot/efi/addon*.efi.stub ${DEPLOYDIR}
+}
+
+addtask deploy before do_build after do_compile
+