builtin/credential-cache: fix missing parameter for stub function

When not compiling the credential cache we may use a stub function for
`cmd_credential_cache()`. With commit 9b1cb50 (builtin: add a
repository parameter for builtin functions, 2024-09-13), we have added a
new parameter to all of those top-level `cmd_*()` functions, and did
indeed adapt the non-stubbed-out `cmd_credential_cache()`. But we didn't
adapt the stubbed-out variant, so the code does not compile.

Fix this by adding the missing parameter.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Taylor Blau <[email protected]>

Author: pks-t

builtin/credential-cache.c

@@ -189,7 +189,8 @@ int cmd_credential_cache(int argc,
 
 #else
 
-int cmd_credential_cache(int argc, const char **argv, const char *prefix)
+int cmd_credential_cache(int argc, const char **argv, const char *prefix,
+			 struct repository *repo UNUSED)
 {
 	const char * const usage[] = {
 		"git credential-cache [options] <action>",