patch 8.2.1964: not all ConTeXt files are recognized

Problem:    Not all ConTeXt files are recognized.
Solution:   Add two patterns. (closes #7263)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index a7d60d7..0e5a0cd 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -110,7 +110,7 @@
     \ 'conaryrecipe': ['file.recipe'],
     \ 'conf': ['auto.master'],
     \ 'config': ['configure.in', 'configure.ac', 'Pipfile', '/etc/hostname.file'],
-    \ 'context': ['tex/context/any/file.tex', 'file.mkii', 'file.mkiv', 'file.mkvi'],
+    \ 'context': ['tex/context/any/file.tex', 'file.mkii', 'file.mkiv', 'file.mkvi', 'file.mkxl', 'file.mklx'],
     \ 'cpp': ['file.cxx', 'file.c++', 'file.hh', 'file.hxx', 'file.hpp', 'file.ipp', 'file.moc', 'file.tcc', 'file.inl', 'file.tlh'],
     \ 'crm': ['file.crm'],
     \ 'crontab': ['crontab', 'crontab.file', '/etc/cron.d/file', 'any/etc/cron.d/file'],
diff --git a/src/version.c b/src/version.c
index 3ff4586..19f5ba2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1964,
+/**/
     1963,
 /**/
     1962,