patch 9.1.0592: runtime: filetype: Mediawiki files are not recognized

Problem:  filetype: Mediawiki files are not recognized
Solution: detect "*.mw" and "*.wiki" as mediawiki filetype,
          include basic syntax and filetype plugins.
          (AvidSeeker)

closes: #15266

Signed-off-by: AvidSeeker <avidseeker7@protonmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index edb9849..9e66a7c 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -437,6 +437,7 @@
     matlab: ['file.m'],
     maxima: ['file.demo', 'file.dmt', 'file.dm1', 'file.dm2', 'file.dm3',
                 'file.wxm', 'maxima-init.mac'],
+    mediawiki: ['file.mw',  'file.wiki'],
     mel: ['file.mel'],
     mermaid: ['file.mmd', 'file.mmdc', 'file.mermaid'],
     meson: ['meson.build', 'meson.options', 'meson_options.txt'],
diff --git a/src/version.c b/src/version.c
index b9d85a6..c6b6248 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    592,
+/**/
     591,
 /**/
     590,