cgl: remove unused forward declaration of linux_platform

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
cmake: correctly print CMAKE_SYSTEM_NAME

Trivial typo.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
cmake: use the relative path in the install targets

Otherwise make DESTDIR=... install will not function properly.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>