systemd: changes to support merged /usr

- Enable/disable the split-usr support in systemd based on 'usrmerge'
  DISTRO_FEATURE.
- Modify rootprefix to point to ${root_prefix}, rather than ${base_prefix}.
- And fixed firmware path to use ${nonarch_base_libdir} instead of hard-coded
  '/lib', because when 'usrmege' distro feature enabled this path would be
  '/usr/lib'.

(From OE-Core rev: 7ca0415c26d5a8b00716b0a49f069e26fdeac30c)

Signed-off-by: Amarnath Valluri <amarnath.valluri@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/systemd/systemd_232.bb

@@ -36,7 +36,7 @@ SRC_URI += " \
 SRC_URI_append_qemuall = " file://0001-core-device.c-Change-the-default-device-timeout-to-2.patch"
 
 PACKAGECONFIG ??= "xz \
-                   ${@bb.utils.filter('DISTRO_FEATURES', 'efi pam selinux ldconfig', d)} \
+                   ${@bb.utils.filter('DISTRO_FEATURES', 'efi pam selinux ldconfig usrmerge', d)} \
                    ${@bb.utils.contains('DISTRO_FEATURES', 'x11', 'xkbcommon', '', d)} \
                    ${@bb.utils.contains('DISTRO_FEATURES', 'wifi', 'rfkill', '', d)} \
                    binfmt \
@@ -119,6 +119,7 @@ PACKAGECONFIG[bzip2] = "--enable-bzip2,--disable-bzip2,bzip2"
 PACKAGECONFIG[lz4] = "--enable-lz4,--disable-lz4,lz4"
 PACKAGECONFIG[xz] = "--enable-xz,--disable-xz,xz"
 PACKAGECONFIG[zlib] = "--enable-zlib,--disable-zlib,zlib"
+PACKAGECONFIG[usrmerge] = "--disable-split-usr, --enable-split-usr"
 
 CACHED_CONFIGUREVARS += "ac_cv_path_KILL=${base_bindir}/kill"
 CACHED_CONFIGUREVARS += "ac_cv_path_KMOD=${base_bindir}/kmod"
@@ -128,7 +129,7 @@ CACHED_CONFIGUREVARS += "ac_cv_path_SULOGIN=${base_sbindir}/sulogin"
 
 # Helper variables to clarify locations.  This mirrors the logic in systemd's
 # build system.
-rootprefix ?= "${base_prefix}"
+rootprefix ?= "${root_prefix}"
 rootlibdir ?= "${base_libdir}"
 rootlibexecdir = "${rootprefix}/lib"
 
@@ -146,10 +147,9 @@ CACHED_CONFIGUREVARS_class-target = "\
 EXTRA_OECONF = " --with-rootprefix=${rootprefix} \
                  --with-rootlibdir=${rootlibdir} \
                  --with-roothomedir=${ROOT_HOME} \
-                 --enable-split-usr \
                  --without-python \
                  --with-sysvrcnd-path=${sysconfdir} \
-                 --with-firmware-path=/lib/firmware \
+                 --with-firmware-path=${nonarch_base_libdir}/firmware \
                  --with-testdir=${PTEST_PATH} \
                "
 # per the systemd README, define VALGRIND=1 to run under valgrind