drm: Add/reorder headers as required by check-preprocessor-syntax.sh
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.
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