Testsuite suggestions

[Joern Rennecke]

>  make check-g77 \
>     RUNTESTFLAGS="--target_board 'unix{-mi386,-mi486,-mi586,-mi686}'"
                                  ^ You want an equal signe here, like in:

make check-gcc RUNTESTFLAGS='--target_board=sh-hms-sim/-m3e'