patch 9.0.1420: build failure because SIZE_MAX is not defined

Problem:    Build failure because SIZE_MAX is not defined.
Solution:   Define SIZE_MAX when missing. (John Marriott)

Author: brammool

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1420,
 /**/
     1419,
 /**/

src/xdiff/xmacros.h

@@ -24,7 +24,11 @@
 #define XMACROS_H
 
 
-
+#ifdef __hpux
+# ifndef SIZE_MAX
+#  define SIZE_MAX ((size_t)(-1))
+# endif
+#endif
 
 #define XDL_MIN(a, b) ((a) < (b) ? (a): (b))
 #define XDL_MAX(a, b) ((a) > (b) ? (a): (b))