patch 8.2.1885: filetype tests unnessarily creates swap files

Problem:    Filetype tests unnessarily creates swap files.
Solution:   Disable 'swapfile'. (Ken Takata, closes #7183)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 9d997cb..a7d60d7 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -549,6 +549,7 @@
     \ }
 
 func CheckItems(checks)
+  set noswapfile
   for [ft, names] in items(a:checks)
     for i in range(0, len(names) - 1)
       new
@@ -565,6 +566,7 @@
       bwipe!
     endfor
   endfor
+  set swapfile&
 endfunc
 
 func Test_filetype_detection()
diff --git a/src/version.c b/src/version.c
index 56bf8f6..0716ca1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1885,
+/**/
     1884,
 /**/
     1883,