multilib.conf: remove appending to PKG_CONFIG_PATH

* Since commit [a23c482cab allarch: only enable allarch when multilib is
not used], allarch recipes will also be installed into
${MLPREFIX}recipe-sysroot, so this appending is not needed.

* This appending also causes some QA errors. Eg: for lib32-php, the
recipe will use 's@${RECIPE_SYSROOT}@@g' to remove host specific path,
this appending makes not all the host specific path are matched.

(From OE-Core rev: e88f159989cbf8080f0a8fb449c878f2a5747774)

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit e6e6076f1956c711814c14d76194794d950e45f8)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/conf/multilib.conf

@@ -22,15 +22,6 @@ MULTILIB_GLOBAL_VARIANTS ?= "lib32 lib64 libx32"
 
 OPKG_ARGS:append = " --force-maintainer --force-overwrite"
 
-# When multilib is enabled, allarch recipes will be installed into the MACHINE
-# sysroot, not MLPREFIXMACHINE.  This means that anything using pkg-config to
-# find an allarch pkgconfig file will fail as the PKG_CONFIG_PATH only looks
-# inside the multilib sysroot.  Fix this by explicitly adding the MACHINE's
-# architecture-independent pkgconfig location to PKG_CONFIG_PATH.
-PKG_CONFIG_PATH .= ":${WORKDIR}/recipe-sysroot/${datadir}/pkgconfig"
-PKG_CONFIG_PATH[vardepsexclude] = "datadir WORKDIR"
-PKG_CONFIG_PATH[vardepvalueexclude] = ":${WORKDIR}/recipe-sysroot/${datadir}/pkgconfig"
-
 # These recipes don't need multilib variants, the ${BPN} PROVDES/RPROVDES
 # ${MLPREFIX}${BPN}
 NON_MULTILIB_RECIPES = "grub grub-efi make-mod-scripts ovmf u-boot"