patch 8.1.1526: no numerical value for the patchlevel

Problem:    No numerical value for the patchlevel.
Solution:   Add v:versionlong.
diff --git a/src/eval.c b/src/eval.c
index c86d0a6..e2d3d48 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -193,9 +193,10 @@
     {VV_NAME("termrfgresp",	 VAR_STRING), VV_RO},
     {VV_NAME("termrbgresp",	 VAR_STRING), VV_RO},
     {VV_NAME("termu7resp",	 VAR_STRING), VV_RO},
-    {VV_NAME("termstyleresp",	VAR_STRING), VV_RO},
-    {VV_NAME("termblinkresp",	VAR_STRING), VV_RO},
-    {VV_NAME("event",		VAR_DICT), VV_RO},
+    {VV_NAME("termstyleresp",	 VAR_STRING), VV_RO},
+    {VV_NAME("termblinkresp",	 VAR_STRING), VV_RO},
+    {VV_NAME("event",		 VAR_DICT), VV_RO},
+    {VV_NAME("versionlong",	 VAR_NUMBER), VV_RO},
 };
 
 /* shorthand */
@@ -354,6 +355,7 @@
 	    hash_add(&compat_hashtab, p->vv_di.di_key);
     }
     vimvars[VV_VERSION].vv_nr = VIM_VERSION_100;
+    vimvars[VV_VERSIONLONG].vv_nr = VIM_VERSION_100 * 10000 + highest_patch();
 
     set_vim_var_nr(VV_SEARCHFORWARD, 1L);
     set_vim_var_nr(VV_HLSEARCH, 1L);