Win32: move main macro to a function

diff --git a/RelNotes b/RelNotes
index c300119d9690d6f399569c5e873fafe62cc05237..7b78eb9715d5ba10b65deee6bb565d93ed3cc365 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.9.txt
\ No newline at end of file
+Documentation/RelNotes/1.9.3.txt
\ No newline at end of file