swrast: init vars to silence warnings

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
gallivm: init vars to silence warnings

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
gallium: undef PACKAGE_* macros to silence warnings

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
glsl ir: add as_dereference_record

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
freedreno: use u_debug for debug env vars

Signed-off-by: Rob Clark <robdclark@gmail.com>