Fetch the git submodule to pull libmongoc in

Author: derickr

.evergreen/config.yml

@@ -31,6 +31,12 @@ functions:
     - command: git.get_project
       params:
         directory: "src"
+    # Fetch the libmongoc submodule
+    - command: shell.exec
+      params:
+        working_dir: "src"
+        script: |
+           git submodule update --init
     # Applies the submitted patch, if any
     # Deprecated. Should be removed. But still needed for certain agents (ZAP)
     - command: git.apply_patch