ipconfig: Add stub implementation.
diff --git a/configure b/configure
index 907dbe0..844dde5 100755
--- a/configure
+++ b/configure
@@ -14905,6 +14905,7 @@
 wine_fn_config_program hh enable_hh install
 wine_fn_config_program icinfo enable_icinfo install
 wine_fn_config_program iexplore enable_iexplore install
+wine_fn_config_program ipconfig enable_ipconfig install
 wine_fn_config_program lodctr enable_lodctr install
 wine_fn_config_program mshta enable_mshta install
 wine_fn_config_program msiexec enable_msiexec installbin