If cairo-drm-intel-brw-eu.h and/or cairo-drm-intel-brw-structs.h are
intended to be private headers, then the change to include cairo.h can
be dropped but the headers should be renamed *-private.h to conform with
Cairo standards.

I'm not certain why check-preprocessor-syntax.sh started flagging these
issues, as it doesn't look like there's been changes to them recently.
But the release scripts won't move forward without these being fixed.