mariadb: fix darwin build

pkgs/servers/sql/mariadb/default.nix

@@ -44,7 +44,10 @@ common = rec { # attributes common to both builds
 
   patches = [
     ./cmake-includedir.patch
-  ];
+  ]
+  # Fixes a build issue as documented on
+  # https://jira.mariadb.org/browse/MDEV-26769?focusedCommentId=206073&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-206073
+  ++ lib.optional (!stdenv.isLinux) ./macos-MDEV-26769-regression-fix.patch;
 
   cmakeFlags = [
     "-DBUILD_CONFIG=mysql_release"

pkgs/servers/sql/mariadb/macos-MDEV-26769-regression-fix.patch

@@ -0,0 +1,12 @@
+diff -ru a/storage/innobase/include/buf0types.h b/storage/innobase/include/buf0types.h
+--- a/storage/innobase/include/buf0types.h	2021-11-17 02:37:32.000000000 -0500
++++ b/storage/innobase/include/buf0types.h	2021-11-17 02:38:50.000000000 -0500
+@@ -179,7 +179,7 @@
+ #include "sux_lock.h"
+ 
+ #ifdef SUX_LOCK_GENERIC
+-class page_hash_latch : private rw_lock
++class page_hash_latch : public rw_lock
+ {
+   /** Wait for a shared lock */
+   void read_lock_wait();