Changed CONTEXT into CONTEXT86 everywhere we really want an i386
context.
Added #ifdef __i386__ around accesses to 386 registers in the generic
CONTEXT structure.

diff --git a/msdos/int41.c b/msdos/int41.c
index 85c4e26..76f3554 100644
--- a/msdos/int41.c
+++ b/msdos/int41.c
@@ -11,7 +11,7 @@
  *           INT_Int41Handler
  *
  */
-void WINAPI INT_Int41Handler( CONTEXT *context )
+void WINAPI INT_Int41Handler( CONTEXT86 *context )
 {
     if ( ISV86(context) )
     {