Remove checks for ancient gcc/MinGW versions.

Don't test for wxUSE_NORLANDER_HEADERS, this is always true since many, many
years.

Remove tests for gcc version < 3.3, notably 2.95: the minimal supported gcc
version is 3.4.

Closes #15727.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76549 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/registry.cpp

@@ -372,14 +372,7 @@ bool wxRegKey::GetKeyInfo(size_t *pnSubKeys,
 
   #define REG_PARAM(name) &dw##name
 #else // Win32
-  // Old gcc headers incorrectly prototype RegQueryInfoKey() as taking
-  // size_t but normally we need a cast, even when sizeof(size_t) is the same
-  // as sizeof(DWORD).
-  #if defined(__GNUWIN32_OLD__) && !defined(__CYGWIN10__)
-    #define REG_PARAM(name) pn##name
-  #else
-    #define REG_PARAM(name)   (LPDWORD)(pn##name)
-  #endif
+  #define REG_PARAM(name)   (LPDWORD)(pn##name)
 #endif