Extend VPI and build to for SIMetrix cosimulation

Added: basic vpiPort VPI Objects for vpiModulkes
    vpiDirection, vpiPortIndex,   vpiName, vpiSize attributes

   Since ports do not exist as net-like entities (nets either side
   module instance boundaries are in effect connect directly in
   the language front-ends internal representation) the port information
   is effectively just meta-data passed through t-dll  interface and
   output as a additional annotation of module scopes in vvp.

Added: vpiLocalParam attribute for vpiParameter VPI objects

Added: support build for 32-bit target on 64-bit host (--with-m32
   option to configure.in and minor tweaks to Makefiles and systemc-vpi).

Module.h

@@ -136,6 +136,9 @@ class Module : public PScopeExtra, public LineInfo {
       const vector<PEIdent*>& get_port(unsigned idx) const;
       unsigned find_port(const char*name) const;
 
+      // Return port name ("" for undeclared port)
+      perm_string get_port_name(unsigned idx) const;
+
       PGate* get_gate(perm_string name);
 
       const list<PGate*>& get_gates() const;