waffle: upgrade 1.7.0 -> 1.7.2

The Waffle bugfix release 1.7.1 is now available.

What is new in this release:
  - cmake: pass deps' cflags to the build
  - gbm: fix crash when platform lacks modifier support
  - gitlab-ci: stabilise CI runs under X
  - gitlab-ci: add more warnings, make all warnings fatal
  - gitlab-ci: update to bullseye
  - meson: add override_* support, when using waffle as submodule
  - meson: skip installing bash completion when custom prefix is used
  - meson: silence deprecation warnings
  - meson: generate cmake files only on Windows
  - meson: find wayland.xml from wayland-scanner.pc
  - misc: zsh completion
  - misc: fix dozens of compiler warnings
  - misc: update website references
  - wayland: fix build against wayland 1.20

The Waffle bugfix release 1.7.2 is now available.

What is new in this release:
  - all: use format(gnu_printf), enable in mingw
  - meson: don't run TLS checks on mingw
  - wgl: remove unused dummy wgl_error.[ch]

Upstream now only generates CMake files on Windows, so remove all
references to CMake.

A zsh completion is now installed, remove this for now as we don't really
use zsh.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 94cf6ef1)
Signed-off-by: Steve Sakoman <steve@sakoman.com>