patch 8.0.0906: don't recognize Couchbase files

Problem:    Don't recognize Couchbase files.
Solution:   Add filetype detection. (Eugene Ciurana, closes #1951)

src/testdir/test_filetype.vim

@@ -297,6 +297,7 @@ let s:filename_checks = {
     \ 'mush': ['file.mush'],
     \ 'muttrc': ['Muttngrc', 'Muttrc'],
     \ 'mysql': ['file.mysql'],
+    \ 'n1ql': ['file.n1ql', 'file.nql'],
     \ 'named': ['namedfile.conf', 'rndcfile.conf'],
     \ 'nanorc': ['/etc/nanorc', 'file.nanorc'],
     \ 'ncf': ['file.ncf'],

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    906,
 /**/
     905,
 /**/