Added jem target to target.c

Change-Id: Ic25d426197ff9a7936c1bb7c2a395874feec5284
Added jem target to Makefile.am

Change-Id: I46be3f91267a402013a0f04ff61ec2392263e9b0
Added initial blackfin target.

Change-Id: I65fe6df93082d16ae0a3f3196711886ca8b29d48
Fixed warnings to allow compilation with the more restrictive clang.

Change-Id: Ic3f8d20bad609187903f5382e1844275272a44a5