glibmm: add v2.78.0, drop static build support

[valgur]

The support for static builds is quite broken out of the box for this library and the amount of patching required to add support for it seems excessive to me and are a maintenance headache. Especially the code-level patches, in light of the discussion at #17338.

I would have kept the excisting patches for older versions, but I don't think I can delete the shared and fPIC options selectively without conflicting with package_type.

[AbrilRBS]

Regenerating missing binaries now

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 1 (91ea193c5cd832b1e4d3fab8487fc69d6e2b8b57):

• glibmm/2.66.4:
  All packages built successfully! (All logs)

• glibmm/2.75.0:
  All packages built successfully! (All logs)

• glibmm/2.72.1:
  All packages built successfully! (All logs)

• glibmm/2.78.1:
  All packages built successfully! (All logs)

---

Conan v2 pipeline ✔️

Note: Conan v2 builds are now mandatory. Please read our discussion about it.

All green in build 1 (91ea193c5cd832b1e4d3fab8487fc69d6e2b8b57):

• glibmm/2.72.1:
  All packages built successfully! (All logs)

• glibmm/2.66.4:
  All packages built successfully! (All logs)

• glibmm/2.78.1:
  All packages built successfully! (All logs)

• glibmm/2.75.0:
  All packages built successfully! (All logs)

[AbrilRBS]

Thanks a lot, I think this is the way going forward :)