poky.conf: Promote unknown-configure-option to QA Error

Currently, this is a QA warning by default, howver its a useful
check to catch configuration errors, where we might have forgotten
to update or adapt configure options on updates/upgrades to a package

(From meta-yocto rev: a75ad2e4227f715146fc1e07f9abef4e80c1aa12)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/distro/poky.conf

@@ -91,7 +91,7 @@ INHERIT += "poky-sanity"
 # QA check settings - a little stricter than the OE-Core defaults
 WARN_TO_ERROR_QA = "already-stripped compile-host-path install-host-path \
                     installed-vs-shipped ldflags pn-overrides rpaths staticdev \
-                    useless-rpaths"
+                    unknown-configure-option useless-rpaths"
 WARN_QA_remove = "${WARN_TO_ERROR_QA}"
 ERROR_QA_append = " ${WARN_TO_ERROR_QA}"