extensions: remove COMPMOD preprocessor defines

COMPMOD_RESPREFIX=abp was unused ever since initial commit in 2001.

COMPMOD_NAMESPACE was used to set the namespace name qualifier of
the helper in componentmodule.hxx to the extension's namespace name.

I don't see why this is necessary as the helper is always compiled in
a separate extension library.

Change-Id: I287607008db3dc0ebc32731536747a921c91807d
Reviewed-on: https://gerrit.libreoffice.org/39184
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>

compilerplugins/clang/vclwidgets.cxx

@@ -373,7 +373,7 @@ bool VCLWidgets::VisitVarDecl(const VarDecl * pVarDecl) {
         || tc.Class("list").StdNamespace()
         || tc.Class("mem_fun1_t").StdNamespace()
           // registration template thing, doesn't actually allocate anything we need to care about
-        || tc.Class("OMultiInstanceAutoRegistration").Namespace("dbp").GlobalNamespace())
+        || tc.Class("OMultiInstanceAutoRegistration").Namespace("compmodule").GlobalNamespace())
     {
         return true;
     }