i965: update Makefile.sources for perf changes

brw_performance_query_metrics.h was removed in
134e750e16 and
brw_performance_query.h was removed in
8ae6667992

remove reference to these files from Makefile.sources

Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Fixes: 134e750e16 ("i965: extract performance query metrics")
Fixes: 8ae6667992 ("intel/perf: move query_object into perf")
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>

src/mesa/drivers/dri/i965/Makefile.sources

@@ -35,9 +35,7 @@ i965_FILES = \
 	brw_object_purgeable.c \
 	brw_pipe_control.c \
 	brw_pipe_control.h \
-	brw_performance_query.h \
 	brw_performance_query.c \
-	brw_performance_query_metrics.h \
 	brw_program.c \
 	brw_program.h \
 	brw_program_binary.c \