Add a new option to 't/helper/test-submodule-config.c' to set a custom
path for the gitmodules file.

In particular this is needed to make 't/t7411-submodule-config.sh' pass.

The option is actually put in use by the script that patches the test
suite.
---
 t/helper/test-submodule-config.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/t/helper/test-submodule-config.c b/t/helper/test-submodule-config.c
index 5c6e4b010..30b4ea3da 100644
--- a/t/helper/test-submodule-config.c
+++ b/t/helper/test-submodule-config.c
@@ -25,6 +25,13 @@ int cmd__submodule_config(int argc, const char **argv)
                        output_url = 1;
                if (!strcmp(arg[0], "--name"))
                        lookup_name = 1;
+               if (!strcmp(arg[0], "--submodules_file")) {
+                       arg++;
+                       my_argc--;
+                       submodules_file = expand_user_path(arg[0], 0);
+                       if (!submodules_file)
+                               die(_("failed to expand user dir in: '%s'"), 
arg[0]);
+               }
                arg++;
                my_argc--;
        }
-- 
2.17.0

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