[BUILD] - add missing = in Autoconf.mo.omdev.mingw

Belonging to [master]:
  - #3021

Author: adrpo

Compiler/Util/Autoconf.mo.omdev.mingw

@@ -17,7 +17,7 @@ encapsulated package Autoconf
 
   constant String platform = if is64Bit then "WIN64" else "WIN32";
   constant String pathDelimiter = "/";
-  constant String groupDelimiter ";";
+  constant String groupDelimiter = ";";
 
   constant String corbaLibs = "-L$(OPENMODELICAHOME)/lib/omc -lomniORB420_rt -lomnithread40_rt";
   constant list<String> systemLibs = {};