* defcmp.pas:
        + Extend compare_def_ext by the possiblity to specify whether strict or
          loose comparison of undefined defs should be applied.
          * in strict mode undefined defs are incompatible to all other defs
            except other undefined defs
          * in loose mode undefined defs are equal to anything (this is how
            FPC behaved up to now)
        + Enable the strict mode in compare_paras so that overloads with
          generic type parameters are possible
* ptype.pas, single_type:
        If the generic dummy of the currently parsed generic is encountered in
        non-Delphi modes then we need to return the current genericdef. This
        condition needs to be checked using the ObjName of the def, because
        the link from the type symbol to the current def is not yet 
        established 
+ added test for bug report

git-svn-id: trunk@20345 -