chicken_install.bbclass: Add a '-dev' package
chicken_install.bbclass: Add a '-dev' package

Some eggs (e.g: protobuf) provide files in ${includedir} and those
need to be installed for development, so the '-dev' package is the
best place for these files.

Change-Id: I0c080da972c3508929df4ba88e96dd9877cb8071
Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

OSSystems/meta-chicken,OSSystems/meta-chicken,OSSystems/meta-chicken