add owners matcher for configurations/meson.build

The configurations/meson.build is an auto generated file which gets
updated when a new .json configuration file is added. Add owners matcher
for this so configurations/<organization> owners can help review and
merge the changes for this file.

Change-Id: Ie3d9ffecf32e494ba5f7870c50848febe206263c
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>
diff --git a/OWNERS b/OWNERS
index 99977d9..f234e5c 100644
--- a/OWNERS
+++ b/OWNERS
@@ -41,6 +41,9 @@
 - christopher.sides@hpe.com
 
 matchers:
+- partial_regex: configurations/meson.build
+  owners:
+    - paligill@gmail.com
 - partial_regex: configurations/meta
   owners:
     - paligill@gmail.com