Revert "build: Bump Meson dependency to 0.64.0"

This reverts commit 91f14cd058.

The freedesktop SDK, which is used by gnome-build-meta, only has Meson
0.63. Bumping GLib’s Meson dependency to 0.64 means that, at the moment,
GLib is not buildable in gnome-build-meta and hence can’t be tested in
nightly pipelines against other projects, etc.

That’s bad for testing GLib.

It’s arguably bad that we’re restricted to using an older version of
Meson than shipped by Debian Testing, but that’s a separate discussion
to be had.

Revert the Meson 0.64 dependency until the freedesktop SDK ships Meson ≥
0.64. This also means reverting the simplifications to use of
`gnome.mkenum_simple()`.

See https://gitlab.gnome.org/GNOME/glib/-/merge_requests/3077#note_1601064

.gitlab-ci.yml

@@ -11,10 +11,10 @@ cache:
     - _ccache/
 
 variables:
-  FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/glib/fedora:v20"
-  COVERITY_IMAGE: "registry.gitlab.gnome.org/gnome/glib/coverity:v8"
-  DEBIAN_IMAGE: "registry.gitlab.gnome.org/gnome/glib/debian-stable:v15"
-  MINGW_IMAGE: "registry.gitlab.gnome.org/gnome/glib/mingw:v10"
+  FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/glib/fedora:v19"
+  COVERITY_IMAGE: "registry.gitlab.gnome.org/gnome/glib/coverity:v7"
+  DEBIAN_IMAGE: "registry.gitlab.gnome.org/gnome/glib/debian-stable:v14"
+  MINGW_IMAGE: "registry.gitlab.gnome.org/gnome/glib/mingw:v9"
   MESON_TEST_TIMEOUT_MULTIPLIER: 4
   G_MESSAGES_DEBUG: all
   MESON_COMMON_OPTIONS: "--buildtype debug --wrap-mode=nodownload --fatal-meson-warnings"
@@ -439,9 +439,6 @@ freebsd-12-x86_64:
     LANG: C.UTF-8
   before_script:
     - bash .gitlab-ci/show-execution-environment.sh
-    - python3 -m ensurepip --user
-    - /var/tmp/gitlab_runner/.local/bin/pip3 install --user meson==0.64.0
-    - export PATH=/var/tmp/gitlab_runner/.local/bin:$PATH
   script:
     # We cannot use -Wl,--no-undefined because GLib uses 'environ' variable.
     # FreeBSD supports xattr, but its API is different from Linux xattr.
@@ -475,9 +472,6 @@ freebsd-13-x86_64:
     LANG: C.UTF-8
   before_script:
     - bash .gitlab-ci/show-execution-environment.sh
-    - python3 -m ensurepip --user
-    - /var/tmp/gitlab_runner/.local/bin/pip3 install --user meson==0.64.0
-    - export PATH=/var/tmp/gitlab_runner/.local/bin:$PATH
   script:
     - meson ${MESON_COMMON_OPTIONS} --localstatedir=/var -Db_lundef=false -Dxattr=false _build
     - ninja -C _build
@@ -509,7 +503,7 @@ macos:
     CFLAGS: '-Wno-overlength-strings'
   before_script:
     - bash .gitlab-ci/show-execution-environment.sh
-    - pip3 install --user meson==0.64.0
+    - pip3 install --user meson==0.60.1
     - pip3 install --user ninja
     - export PATH=/Users/gitlabrunner/Library/Python/3.7/bin:$PATH
   script:

.gitlab-ci/coverity.Dockerfile

@@ -1,4 +1,4 @@
-FROM registry.gitlab.gnome.org/gnome/glib/fedora:v20
+FROM registry.gitlab.gnome.org/gnome/glib/fedora:v18
 
 ARG COVERITY_SCAN_PROJECT_NAME
 ARG COVERITY_SCAN_TOKEN

.gitlab-ci/debian-stable.Dockerfile

@@ -66,7 +66,7 @@ RUN locale-gen de_DE.UTF-8 \
 
 ENV LANG=C.UTF-8 LANGUAGE=C.UTF-8 LC_ALL=C.UTF-8
 
-RUN pip3 install meson==0.64.0
+RUN pip3 install meson==0.60.3
 
 # FIXME: Once we use Debian Bookworm, we can just install the `reuse` package
 RUN pip3 install reuse==1.0.0

.gitlab-ci/fedora.Dockerfile

@@ -74,7 +74,7 @@ RUN dnf -y update \
     make \
  && dnf clean all
 
-RUN pip3 install meson==0.64.0
+RUN pip3 install meson==0.60.3
 
 COPY install-gitlab-cobertura-tools.sh .
 RUN ./install-gitlab-cobertura-tools.sh

.gitlab-ci/mingw.Dockerfile

@@ -57,7 +57,7 @@ RUN dnf -y install \
 WORKDIR /opt
 COPY cross_file_mingw64.txt /opt
 
-RUN pip3 install meson==0.64.0
+RUN pip3 install meson==0.60.3
 
 ARG HOST_USER_ID=5555
 ENV HOST_USER_ID ${HOST_USER_ID}

.gitlab-ci/test-msvc.bat

@@ -12,7 +12,7 @@ for %%x in (%*) do (
 set args=%args:~1%
 
 :: FIXME: make warnings fatal
-pip3 install --upgrade --user meson==0.64.0  || goto :error
+pip3 install --upgrade --user meson==0.60.3  || goto :error
 meson %args% _build || goto :error
 python .gitlab-ci/check-missing-install-tag.py _build || goto :error
 ninja -C _build || goto :error

.gitlab-ci/test-msys2.sh

@@ -26,7 +26,7 @@ CCACHE_BASEDIR="$(pwd)"
 CCACHE_DIR="${CCACHE_BASEDIR}/_ccache"
 export CCACHE_BASEDIR CCACHE_DIR
 
-pip3 install --upgrade --user meson==0.64.0
+pip3 install --upgrade --user meson==0.60.3
 
 PATH="$(cygpath "$USERPROFILE")/.local/bin:$HOME/.local/bin:$PATH"
 DIR="$(pwd)"

meson.build

@@ -1,7 +1,7 @@
 project('glib', 'c',
   version : '2.75.1',
   # NOTE: See the policy in docs/meson-version.md before changing the Meson dependency
-  meson_version : '>= 0.64.0',
+  meson_version : '>= 0.60.0',
   default_options : [
     'buildtype=debugoptimized',
     'warning_level=3',