patch 8.0.1310: cproto generates errors because of missing type

Problem:    Cproto generates errors because of missing type.
Solution:   Define _Float128 when generating prototypes.

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1310,
 /**/
     1309,
 /**/

src/vim.h

@@ -9,6 +9,11 @@
 #ifndef VIM__H
 # define VIM__H
 
+#ifdef PROTO
+/* cproto runs into trouble when this type is missing */
+typedef double _Float128;
+#endif
+
 /* use fastcall for Borland, when compiling for Win32 */
 #if defined(__BORLANDC__) && defined(WIN32) && !defined(DEBUG)
 #if defined(FEAT_PERL) || \