Fix so Win32 assembly language works with MASM.

Add info about where to get MASM.
diff --git a/CHANGES b/CHANGES
index 58bd9e8..c08fa85 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,13 @@
 
  Changes between 0.9.4 and 0.9.5  [xx XXX 2000]
 
+  *) Add an optional second argument to the set_label() in the perl
+     assembly language builder. If this argument exists and is set
+     to 1 it signals that the assembler should use a symbol whose 
+     scope is the entire file, not just the current function. This
+     is needed with MASM which uses the format label:: for this scope.
+     [Steve Henson, pointed out by Peter Runestig <peter@runestig.com>]
+
   *) Change the ASN1 types so they are typedefs by default. Before
      almost all types were #define'd to ASN1_STRING which was causing
      STACK_OF() problems: you couldn't declare STACK_OF(ASN1_UTF8STRING)