patch 9.0.0942: Workflow Description Language files are not recognized

Problem:    Workflow Description Language files are not recognized.
Solution:   Add a pattern for the "wdl" filetype. (Matt Dunford,
            closes #11611)

runtime/filetype.vim

@@ -2349,6 +2349,9 @@ au BufNewFile,BufRead fglrxrc			setf xml
 " Web Services Description Language (WSDL)
 au BufNewFile,BufRead *.wsdl			setf xml
 
+" Workflow Description Language (WDL)
+au BufNewFile,BufRead *.wdl			setf wdl
+
 " XLIFF (XML Localisation Interchange File Format) is also XML
 au BufNewFile,BufRead *.xlf			setf xml
 au BufNewFile,BufRead *.xliff			setf xml

src/testdir/test_filetype.vim

@@ -623,6 +623,7 @@ let s:filename_checks = {
     \ 'vroom': ['file.vroom'],
     \ 'vue': ['file.vue'],
     \ 'wast': ['file.wast', 'file.wat'],
+    \ 'wdl': ['file.wdl'],
     \ 'webmacro': ['file.wm'],
     \ 'wget': ['.wgetrc', 'wgetrc'],
     \ 'wget2': ['.wget2rc', 'wget2rc'],

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    942,
 /**/
     941,
 /**/