gitlab-ci: Disable cmake:mingw for now

Executing /mingw64/bin/cmake.exe with any arguments fails without error
message and exit code 127 since 2025-01-21. I have no idea why.

.gitlab-ci.yml

@@ -154,6 +154,11 @@ cmake:linux:clang:static:
     CC: clang
     SUFFIX: linux-clang-static
 
+# cmake:mingw is currently broken for unknown reasons.
+#
+# Executing /mingw64/bin/cmake.exe with any arguments fails without error
+# message and exit code 127 since 2025-01-21.
+
 .cmake:mingw:
   tags:
     - win32-ps
@@ -193,6 +198,8 @@ cmake:mingw:w64-i686:static:
 
 cmake:mingw:w64-x86_64:shared:
   extends: .cmake:mingw
+  only:
+    - schedules
   variables:
     BUILD_SHARED_LIBS: "ON"
     MSYSTEM: MINGW64

.gitlab-ci/test_cmake.sh

@@ -1,19 +1,6 @@
 #!/bin/sh
 
-echo '### 1'
-#set -e
-
-which cmake
-ls -l /mingw64/bin/cmake.exe
-file /mingw64/bin/cmake.exe
-/mingw64/bin/cmake.exe --version
-
-echo CFLAGS="-Werror $CFLAGS" \
-cmake "$@" \
-    -DBUILD_SHARED_LIBS=$BUILD_SHARED_LIBS \
-    -DCMAKE_INSTALL_PREFIX=libxml2-install \
-    -DCMAKE_BUILD_TYPE=RelWithDebInfo \
-    -S . -B libxml2-build
+set -e
 
 CFLAGS="-Werror $CFLAGS" \
 cmake "$@" \
@@ -21,9 +8,7 @@ cmake "$@" \
     -DCMAKE_INSTALL_PREFIX=libxml2-install \
     -DCMAKE_BUILD_TYPE=RelWithDebInfo \
     -S . -B libxml2-build
-echo '### 2'
 cmake --build libxml2-build --target install
-echo '### 3'
 
 (cd libxml2-build && ctest -VV)