chicken: add patch to avoid applying PROGRAM_PREFIX/SUFFIX to target include dir

Change-Id: I07f7728a9c0d53c3f2b4d90310a60700f305f11e
Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
chicken: fix C_COMPILER for the target chicken

Change-Id: If7779734519bcb31a86cf8a6bbebdce523c98c4e
Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Fix all chicken-egg packages to use package specific RDEPENDS

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
gen-egg-recipes: Use package specific RDEPENDS

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
core-image-chicken: Add example image

This adds core-image-chicken (which includes the chicken binaries) and
core-image-chicken-sdk which provides an image capable to work as
standalone development platform.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>