gl-renderer: Support EGL_KHR_partial_update

partial_update is an EGL extension which allows us to inform the driver
ahead of time the limits of the areas we'll be writing to. This helps
performance for GPU hardware which renders into a local tile buffer:
informing the driver of the rendering extents means it can avoid
fetching unchanged tiles into the tile buffer and subsequently writing
them out.

The extension complements rather than replaces EGL_EXT_buffer_age (used
before partial_update to know which areas we need to update) and
EGL_KHR_swap_buffers_with_damage (used after partial_update to inform
the winsys of the changed region).

Note however that partial_update deals in buffer-damage regions ('what
has changed since the last time I used _this_ buffer?'), whereas
swap_buffers_with_damage deals in surface-damage regions ('what has
changed since the last time I rendered?'). An explanatory diagram can be
found in the specification:
https://www.khronos.org/registry/EGL/extensions/KHR/EGL_KHR_partial_update.txt

Fixes: #134

Signed-off-by: Daniel Stone <daniels@collabora.com>
2 jobs from egl-partial-update in 6 minutes and 34 seconds (queued for 1 minute and 32 seconds)
latest
Status Job ID Name Coverage
  Build
passed #104577
build-native-autotools

00:04:15

passed #104578
build-native-meson

00:02:19