Move the CHIL engine to demos/engines

Moving out of the way, Makefile to be added

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2780)

diff --git a/engines/e_chil.c b/demos/engines/e_chil.c
similarity index 100%
rename from engines/e_chil.c
rename to demos/engines/e_chil.c

diff --git a/engines/e_chil.ec b/demos/engines/e_chil.ec
similarity index 100%
rename from engines/e_chil.ec
rename to demos/engines/e_chil.ec

diff --git a/engines/e_chil_err.c b/demos/engines/e_chil_err.c
similarity index 100%
rename from engines/e_chil_err.c
rename to demos/engines/e_chil_err.c

diff --git a/engines/e_chil_err.h b/demos/engines/e_chil_err.h
similarity index 100%
rename from engines/e_chil_err.h
rename to demos/engines/e_chil_err.h