patch 9.0.0479: in :def function all closures in loop get the same variables

Problem:    In a :def function all closures in a loop get the same variables.
Solution:   Use a separate list of variables for LOADOUTER and SAVEOUTER.

runtime/filetype.vim

@@ -2108,6 +2108,9 @@ au BufNewFile,BufRead */.config/upstart/*.override	       setf upstart
 " Vala
 au BufNewFile,BufRead *.vala			setf vala
 
+" VDF
+au BufNewFile,BufRead *.vdf			setf vdf
+
 " VDM
 au BufRead,BufNewFile *.vdmpp,*.vpp		setf vdmpp
 au BufRead,BufNewFile *.vdmrt			setf vdmrt

src/testdir/test_filetype.vim

@@ -595,6 +595,7 @@ let s:filename_checks = {
     \ 'usw2kagtlog': ['usw2kagt.log', 'USW2KAGT.LOG', 'usw2kagt.file.log', 'USW2KAGT.FILE.LOG', 'file.usw2kagt.log', 'FILE.USW2KAGT.LOG'],
     \ 'vala': ['file.vala'],
     \ 'vb': ['file.sba', 'file.vb', 'file.vbs', 'file.dsm', 'file.ctl'],
+    \ 'vdf': ['file.vdf'],
     \ 'vdmpp': ['file.vpp', 'file.vdmpp'],
     \ 'vdmrt': ['file.vdmrt'],
     \ 'vdmsl': ['file.vdm', 'file.vdmsl'],

src/version.c

@@ -703,6 +703,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    479,
 /**/
     478,
 /**/