plymouth: allow disabling the dracut dep

Add a 'initrd' PACKAGECONFIG to disable emission of the plymouth-initrd
package which includes initramfs files for use by dracut. Disabling this will
avoid the runtime dependency on dracut, which is useful if one doesn't need or
want dracut and doesn't want to pull in meta-initramfs.

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
(cherry picked from commit 240e2ebe43)
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-core/plymouth/plymouth_0.9.2.bb

@@ -24,19 +24,18 @@ EXTRA_OECONF += " --enable-shared --disable-static --disable-gtk --disable-docum
                   ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', '--enable-systemd-integration --with-system-root-install', '', d)} \
                 "
 
-PACKAGECONFIG[drm] = "--enable-drm,--disable-drm,libdrm"
-PACKAGECONFIG[pango] = "--enable-pango,--disable-pango,pango"
-PACKAGECONFIG[gtk] = "--enable-gtk,--disable-gtk,gtk+"
-
-PACKAGECONFIG ??= "pango"
-
-LOGO ??= "${datadir}/plymouth/bizcom.png"
-
+PACKAGECONFIG ??= "pango initrd"
 PACKAGECONFIG_append_x86 = " drm"
 PACKAGECONFIG_append_x86-64 = " drm"
 
-inherit autotools pkgconfig systemd
+PACKAGECONFIG[drm] = "--enable-drm,--disable-drm,libdrm"
+PACKAGECONFIG[pango] = "--enable-pango,--disable-pango,pango"
+PACKAGECONFIG[gtk] = "--enable-gtk,--disable-gtk,gtk+"
+PACKAGECONFIG[initrd] = ",,,"
 
+LOGO ??= "${datadir}/plymouth/bizcom.png"
+
+inherit autotools pkgconfig systemd
 
 do_install_append() {
 	install -d ${D}${systemd_unitdir}/system
@@ -44,9 +43,14 @@ do_install_append() {
 	install -m 644 ${B}/systemd-units/systemd-ask-password-plymouth.path ${D}${systemd_unitdir}/system
 	# Remove /var/run from package as plymouth will populate it on startup
 	rm -fr "${D}${localstatedir}/run"
+
+	if ! ${@bb.utils.contains('PACKAGECONFIG', 'initrd', 'true', 'false', d)}; then
+		rm -rf "${D}${libexecdir}"
+	fi
 }
 
-PACKAGES =+ "${PN}-initrd ${PN}-set-default-theme"
+PACKAGES =. "${@bb.utils.contains('PACKAGECONFIG', 'initrd', '${PN}-initrd ', '', d)}"
+PACKAGES =+ "${PN}-set-default-theme"
 
 FILES_${PN}-initrd = "${libexecdir}/plymouth/*"
 FILES_${PN}-set-default-theme = "${sbindir}/plymouth-set-default-theme"