Finalise support for BCB2006

Deprecate support for earlier Borland compilers
Added BCB library detection macros


[SVN r33111]

libs/config

@@ -1 +1 @@
-Subproject commit 9adb18bb68b00a8e0336b22b580bb205635febeb
+Subproject commit 4fc1131f3929aae8718e01b00ea2aa22d8d917ea