configure: create .config file where I intended

Originally committed as revision 24373 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -3142,6 +3142,7 @@ echo "endif # FFMPEG_CONFIG_MAK" >> config.mak
 
 # Do not overwrite an unchanged config.h to avoid superfluous rebuilds.
 cp_if_changed $TMPH config.h
+touch .config
 
 cat > $TMPH <<EOF
 /* Generated by ffconf */
@@ -3154,7 +3155,6 @@ print_config AV_HAVE_ $TMPH /dev/null $HAVE_LIST_PUB
 echo "#endif /* AVUTIL_AVCONFIG_H */" >> $TMPH
 
 cp_if_changed $TMPH libavutil/avconfig.h
-touch .config
 
 test -n "$WARNINGS" && printf "\n$WARNINGS"