abuild: rootbld: fix order of bind-mounts given to bwrap

when building a package with abuildd, a copy of the git checkout is cloned to /tmp, which
causes difficulties.

abuild.in

@@ -2152,9 +2152,9 @@ rootbld() {
 		--ro-bind "$HOME/.abuild" "$HOME/.abuild" \
 		--ro-bind "$aportsgit" "$aportsgit" \
 		--bind "$SRCDEST" "$SRCDEST" \
+		--bind "$BUILD_ROOT/tmp" /tmp \
 		--bind "$BUILD_ROOT/tmp/src" "$srcdir" \
 		--bind "$BUILD_ROOT/tmp/pkg" "$pkgbasedir" \
-		--bind "$BUILD_ROOT/tmp" /tmp \
 		--bind "$REPODEST" "$REPODEST" \
 		--hostname "build-$buildhost-$CARCH" \
 		--chdir "$startdir" \