patch 8.1.1774: test is silently skipped

Problem:    Test is silently skipped.
Solution:   Throw "Skipped".
diff --git a/src/testdir/test_ins_complete.vim b/src/testdir/test_ins_complete.vim
index 29f4050..fedb38a 100644
--- a/src/testdir/test_ins_complete.vim
+++ b/src/testdir/test_ins_complete.vim
@@ -335,7 +335,7 @@
 " Test for insert path completion with completeslash option
 func Test_ins_completeslash()
   if !has('win32')
-    return
+    throw 'Skipped: only works on MS-Windows'
   endif
   
   call mkdir('Xdir')
diff --git a/src/version.c b/src/version.c
index 4463c38..8a3923e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1774,
+/**/
     1773,
 /**/
     1772,