Making sure Z3 compiles with gcc 4.7.1. Making sure 'make release' works. Temporarily removed iz3 and ocaml bindings from 'make release' script. Removed test_user_theory from 'make release' script.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

lib/debug.cpp

@@ -17,6 +17,9 @@ Revision History:
 
 --*/
 #include<cstdio>
+#ifndef _WINDOWS
+#include<unistd.h>
+#endif
 #include<iostream>
 #include"str_hashtable.h"
 

lib/smtparser.cpp

@@ -4243,7 +4243,7 @@ private:
             constructor_decl * c = declare_constructor(*children, dt_names);
             if (!c) {
                 del_constructor_decls(constructors.size(), constructors.c_ptr());
-                return false;
+                return 0;
             }
             constructors.push_back(c);
             ++children;
@@ -4251,7 +4251,7 @@ private:
         
         if (constructors.size() == 0) {
             set_error("datatype must have at least one constructor", e);
-            return false;
+            return 0;
         }
 
         return mk_datatype_decl(name, constructors.size(), constructors.c_ptr());