Filed
https://bugzilla.redhat.com/show_bug.cgi?id=1644446
to let maintainer know to formally retire it from epel7 too.

Note that dropping this will make all dependent packages fail to build on aarch64, since RHEL7 does not ship this package on that architecture.

I'll go rebuild the package to fix it.

Okay, I was looking at the wrong repos.
Now making sure we get it, and will then remove it.

It's blocked.

epel7 buildroot is still broken... somehow. Here's an example,

https://koji.fedoraproject.org/koji/taskinfo?taskID=30598991

It appears that epel7 doesn't see libglvnd at all now. with errors like:
Error: Package: mesa-libGL-devel-18.0.5-3.el7.x86_64 (build)
Requires: libglvnd-devel(x86-64)

Another test with arch'd build to rule out that this is noarch (or ppc64-specific):
https://koji.fedoraproject.org/koji/taskinfo?taskID=30608450
fails similarly on all archs.

More findings:

$ koji list-pkgs  --show-blocked --tag epel7 --package libglvnd
Package                 Tag                     Extra Arches     Owner          
----------------------- ----------------------- ---------------- ---------------
libglvnd                epel7                                    releng          [BLOCKED]

good

$ koji list-pkgs  --show-blocked --tag epel7-build --package libglvnd
Package                 Tag                     Extra Arches     Owner          
----------------------- ----------------------- ---------------- ---------------
libglvnd                epel7                                    releng          [BLOCKED]

not so good (at least compared to at least one other package I recall getting moved from epel7 to rhel7 in the past, qt5-qtbase). that one is blocked for epel7, but not epel7-build

Yes, when blocking a epel package that is now in rhel, you block it in the epel tag, but must unblock it in the build tag or it will ignore the rhel version.

I've done this now. Can you see if it's ok after the next newrepo?

Now it's not blocked at all anymore?

$ koji list-pkgs  --show-blocked --tag epel7 --package libglvnd
Package                 Tag                     Extra Arches     Owner          
----------------------- ----------------------- ---------------- ---------------
libglvnd                epel7                                    releng 

@rdieter There were still some older builds that were tagged into epel7 after the latest got untagged. So, I went ahead and unblocked it and untagged all the older builds and blocked it again.

$ koji list-pkgs  --show-blocked --tag epel7 --package libglvnd
Package                 Tag                     Extra Arches     Owner          
----------------------- ----------------------- ---------------- ---------------
libglvnd                epel7                                    releng          [BLOCKED]

xorgxrdp built successfully on all arches, so I think we're good to go.

confirmed good here too, thank you to all fedora releng heros