Avoid (spurious) GCC 13 warning about overloading

We previously issued a similar fix in 90d9c7a. GCC 13 now reports this
in another two files, fixed in this commit.

Author: tautschnig

src/goto-cc/ms_cl_cmdline.h

@@ -19,6 +19,7 @@ Date: June 2006
 class ms_cl_cmdlinet:public goto_cc_cmdlinet
 {
 public:
+  using cmdlinet::parse;
   virtual bool parse(int, const char **);
 
   ms_cl_cmdlinet()

src/goto-cc/ms_link_cmdline.h

@@ -19,6 +19,7 @@ Date: July 2018
 class ms_link_cmdlinet : public goto_cc_cmdlinet
 {
 public:
+  using cmdlinet::parse;
   virtual bool parse(int, const char **);
 
   ms_link_cmdlinet()