shim 15.5

Much thanks to those who tested this release.

Changes from -rc2:

- Make Mok config table be runtime services memory
- Remove post-process-pe on 'make clean'
- pe: missing perror argument

**Incremental changelog**:
https://github.com/rhboot/shim/compare/15.5-rc2...15.5

From 15.4, the following people contributed code:

- Peter Jones (46)
- Heinrich Schuchardt (7)
- Gary Lin (6)
- Renaud Métrich (4)
- Julian Andres Klode (4)
- Serge Hallyn (2)
- Robbie Harwood (2)
- Nicholas Bishop (2)
- João Paulo Rechi Vita (2)
- Seth Forshee (1)
- Jonathan Yong (1)
- Jonas Witschel (1)
- Javier Martinez Canillas (1)
- Jan Setje-Eilers (1)
- Esther Shimanovich (1)
- Eric Snowberg (1)
- Dimitri John Ledkov (1)
- Daniel Axtens (1)
- Chris Coulson (1)
- Adam Williamson (1)

**Full changelog**:
https://github.com/rhboot/shim/compare/15.4...15.5