patch 8.1.0459: Test_executable fails when there is a dog in the system

Problem:    Test_executable fails when there is a dog in the system.
Solution:   Rename the dog. (Hirohito Higashi)
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index d601c27..e59cdf8 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -855,7 +855,7 @@
     call assert_equal(0, executable('win.ini'))
   elseif has('unix')
     call assert_equal(1, executable('cat'))
-    call assert_equal(0, executable('dog'))
+    call assert_equal(0, executable('nodogshere'))
   endif
 endfunc
 
diff --git a/src/version.c b/src/version.c
index b25f132..c868496 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    459,
+/**/
     458,
 /**/
     457,