cups: Fix reproducibility issues

configure inspects the host's /etc/group for these configuration
options, fix this to the correct values by using configure options.

(From OE-Core rev: f16f9c727569414cd52862dcba18d8e423f4e961)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/reproducible.py

@@ -29,7 +29,6 @@ import datetime
 #https://autobuilder.yocto.io/pub/repro-fail/oe-reproducible-20210215-0_td9la2/packages/diff-html/
 exclude_packages = [
 	'bootchart2-doc',
-	'cups',
 	'efivar',
 	'epiphany',
 	'gcr',

meta/recipes-extended/cups/cups.inc

@@ -54,6 +54,8 @@ EXTRA_OECONF = " \
                --enable-debug \
                --disable-relro \
                --enable-libusb \
+               --with-system-groups=lpadmin \
+               --with-cups-group=lp \
                --with-domainsocket=/run/cups/cups.sock \
                DSOFLAGS='${LDFLAGS}' \
                "