patch 9.0.1393: Cairo files are not recognized

Problem:    Cairo files are not recognized.
Solution:   Add a pattern for Cairo files. (Amaan Qureshi, closes #12118)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index ff438bb..042c25d 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -96,6 +96,7 @@
     \ 'cabal': ['file.cabal'],
     \ 'cabalconfig': ['cabal.config'],
     \ 'cabalproject': ['cabal.project', 'cabal.project.local'],
+    \ 'cairo': ['file.cairo'],
     \ 'calendar': ['calendar', '/.calendar/file', '/share/calendar/any/calendar.file', '/share/calendar/calendar.file', 'any/share/calendar/any/calendar.file', 'any/share/calendar/calendar.file'],
     \ 'capnp': ['file.capnp'],
     \ 'catalog': ['catalog', 'sgml.catalogfile', 'sgml.catalog', 'sgml.catalog-file'],
diff --git a/src/version.c b/src/version.c
index 9689d8b..3a2ff57 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1393,
+/**/
     1392,
 /**/
     1391,