PIXBUFCACHE_SYSROOT_DEPS was removed in oe-core b41108, so remove this
assignment to avoid confusing people reading the recipe.
(From OE-Core rev: fcfd3e76eb52353345aa9a1f7ec0f9795e607493)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>