#15 SuperH targets arent detected properly

[Mike Frysinger]

the configure.ac checks the architecture for linux to
make sure it is supported ... however, the SuperH check
is simply:
sh)

this means that all common targets fail such as:
sh4-linux-gnu
sheb-linux-gnu
sh2a-linux-gnu
etc...

find attached a patch to resolve this issue

[Eugene Syromyatnikov]

Fixed in 67828ca1a5c69146d0d2c368935e1826b25c5679.