don't clone the history of submodules in Windows CI tasks

The Windows builds only need the tip of these repositories, so no need to spend
time and bandwidth retrieving their history.

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b908a806a067b0160e5eae519e9aed03e6821d07..667977190ea115a633fcb0071fcd30c68350920e 100644 (file)
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -126,7 +126,7 @@ portable-source:
             $TARGET_ARCH = "x86";
           }
         # Retrieve submodules, dependencies are stored there.
-        - git submodule update --init
+        - git submodule update --init --depth 1
         # Install and set PATH
         - $Env:graphviz_install_dir = "C:\Graphviz"
         # Build