Fix bugzilla issue 22688 - Disambiguate module and struct mangling

Author: CHIKI Badreddine

compiler/src/dmd/mangle/package.d

@@ -568,6 +568,8 @@ public:
             else if (p.getIdent())
             {
                 mangleIdentifier(p.ident, s);
+                if (p.isModule() || p.isPackage())
+                    buf.writeByte('M');
                 if (FuncDeclaration f = p.isFuncDeclaration())
                     mangleFunc(f, true);
             }
@@ -921,7 +923,11 @@ public:
         }
         mangleParent(s);
         if (s.ident)
+        {
             mangleIdentifier(s.ident, s);
+            if (s.isModule() || s.isPackage())
+                buf.writeByte('M');
+        }
         else
             toBuffer(*buf, s.toString(), s);
         //printf("Dsymbol.mangle() %s = %s\n", s.toChars(), id);