This does not sound to me like an appropriate change for an SRU; the chance of a regression affecting other SRU builds is very high, since this is a change that globally affects the build options seen by any python extensions when building. If there are specific extension packages that are broken without these default build options, I would be more comfortable with identifying those individually and kludging the build options on a per-package basis; those packages would need to be re-uploaded to take advantage of this change anyway.
This does not sound to me like an appropriate change for an SRU; the chance of a regression affecting other SRU builds is very high, since this is a change that globally affects the build options seen by any python extensions when building. If there are specific extension packages that are broken without these default build options, I would be more comfortable with identifying those individually and kludging the build options on a per-package basis; those packages would need to be re-uploaded to take advantage of this change anyway.