patch 9.1.1234: Compile error when SIZE_MAX is not defined

Problem:  Compile error when SIZE_MAX is not defined
Solution: Define SIZE_MAX (Zoltan Arpadffy)

related: #16962

Signed-off-by: Zoltan Arpadffy <zoltan.arpadffy@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1234,
 /**/
     1233,
 /**/

src/vim.h

@@ -87,6 +87,13 @@
 # endif
 #endif
 
+// C89 does not define SIZE_MAX
+#if defined(__hpux) || defined(VMS)
+# ifndef SIZE_MAX
+#  define SIZE_MAX ((size_t)(-1))
+# endif
+#endif
+
 // user ID of root is usually zero, but not for everybody
 #ifdef __TANDEM
 # ifndef _TANDEM_SOURCE