github: Pin QEMU to 9.0.2 on Ubuntu 20.04

Signed-off-by: Stéphane Graber <[email protected]>

.github/workflows/builds.yml

@@ -39,6 +39,7 @@ jobs:
 
     env:
       OS_ARCH: ${{ matrix.arch }}
+      OS_NAME: ${{ matrix.os }}
       HOME: "/root/"
       PKG_CONFIG_PATH: "/opt/incus/lib/pkgconfig/"
       CGO_LDFLAGS: "-L/opt/incus/lib/"
@@ -200,6 +201,9 @@ jobs:
 
       - name: Get the code
         run: |
+          # Ubuntu 20.04 is no longer supported by recent QEMU.
+          [ "${OS_NAME}" = "ubuntu-20.04" ] && QEMU_TAG="9.0.2"
+
           git clone https://github.com/axboe/liburing /build/liburing --depth 1 -b "${LIBURING_TAG}"
           git clone https://github.com/cowsql/raft /build/raft --depth 1 -b "${RAFT_TAG}"
           git clone https://github.com/cowsql/cowsql /build/cowsql --depth 1 -b "${COWSQL_TAG}"
@@ -561,7 +565,6 @@ jobs:
         run: |
           cd /build/qemu
           sed -i "s/^unset target_list$/target_list=\"$(uname -m)-softmmu\"/" configure
-          sed -i "s/^glib_req_ver = '>=2.66.0'/glib_req_ver = '>=2.64.0'/" meson.build
           ./configure \
                   --prefix=/opt/incus \
                   --libexecdir=bin \