Add some more documentation to the PIXBUFCACHE_SYSROOT_DEPS variable to clarify
the usage.
(From OE-Core rev: b2f2d6a2b166b3c79cc5a0d386ee1dda2d4fa010)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>