xbps-src: check_pkg_arch now exits with errcode 2.

common/xbps-src/shutils/pkgtarget.sh

@@ -1,7 +1,7 @@
 # vim: set ts=4 sw=4 et:
 
 check_pkg_arch() {
-    local cross="$1" err="$2" _arch f found
+    local cross="$1" _arch f found
 
     if [ -n "$only_for_archs" ]; then
         if [ -n "$cross" ]; then
@@ -19,7 +19,7 @@ check_pkg_arch() {
         done
         if [ -z "$found" ]; then
             msg_red "$pkgname: this package cannot be built for ${_arch}.\n"
-            exit ${err:=0}
+            exit 2
         fi
     fi
 }