ENH: Make sure that we find the proper symbol and not the one that start with _. STYLE: Remove an old style cast

Source/kwsys/DynamicLoader.cxx

@@ -305,7 +305,7 @@ int DynamicLoader::CloseLibrary(LibHandle lib)
   if (lib)
     {
     // The function dlclose() returns 0 on success, and non-zero on error.
-    return !(int)dlclose(lib);
+    return !dlclose(lib);
     }
   // else
   return 0;

Source/kwsys/testDynamicLoader.cxx

@@ -89,7 +89,9 @@ int main(int , char *[])
   kwsys_stl::string libname = GetLibName("testDynload");
   res += TestDynamicLoader(libname.c_str(), "dummy",1,0,1);
   res += TestDynamicLoader(libname.c_str(), "TestDynamicLoaderFunction",1,1,1);
+  res += TestDynamicLoader(libname.c_str(), "_TestDynamicLoaderFunction",1,0,1);
   res += TestDynamicLoader(libname.c_str(), "TestDynamicLoaderData",1,1,1);
+  res += TestDynamicLoader(libname.c_str(), "_TestDynamicLoaderData",1,0,1);
 
   return res;
 }