xbps-src: setup main pkg in setup_subpkg_tmpl() if it's not a subpkg.

xbps-src/shutils/tmpl_funcs.sh.in

@@ -146,7 +146,7 @@ setup_subpkg_tmpl()
 
 	if [ -r "$XBPS_SRCPKGDIR/$1/$1.template" ]; then
 		setup_tmpl $1
-		unset run_depends
+		unset run_depends build_depends
 		. $XBPS_SRCPKGDIR/$1/$1.template
 		for f in ${subpackages}; do
 			if [ "$subpkg" = "$1" ]; then
@@ -155,6 +155,8 @@ setup_subpkg_tmpl()
 				break
 			fi
 		done
+	else
+		setup_tmpl $1
 	fi
 }