Fix for xf86InterceptSigIll() discontinuation in X Server 1.20

xf86InterceptSigIll() will still be used on X.Org X Server 1.19 or
older.
Signed-off-by: Kevin Brace <kevinbrace@gmx.com>

src/sis.h

@@ -270,7 +270,7 @@
 
 #undef SISCHECKOSSSE
 #ifdef XORG_VERSION_CURRENT
-#if XORG_VERSION_CURRENT >= XORG_VERSION_NUMERIC(6,8,99,13,0)
+#if (XORG_VERSION_CURRENT >= XORG_VERSION_NUMERIC(6,8,99,13,0)) || (XORG_VERSION_CURRENT < XORG_VERSION_NUMERIC(1,19,99,1,0))
 #define SISCHECKOSSSE		/* Automatic check OS for SSE; requires SigIll facility */
 #endif
 #endif