Evaluate mingw64_env to setup properly on CI
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bac8f33..ef49b10 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -124,6 +124,7 @@
     - export BUILD_ID="fontconfig-$CI_JOB_NAME_$CI_COMMIT_SHA-$CI_JOB_ID"
     - export PREFIX="$(pwd)/prefix-$BUILD_ID"
     - export BUILDDIR="$(pwd)/build-$BUILD_ID"
+    - eval `rpm --eval %{mingw64_env}`
     - meson --prefix="$PREFIX" "$BUILDDIR" --cross-file .gitlab-ci/linux-mingw-w64-64bit.txt
     - ninja -C "$BUILDDIR"
     - ninja -C "$BUILDDIR" test