.mailmap: add an alias for Christian Inci

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index 1c3facb..284a25f 100644
--- a/.mailmap
+++ b/.mailmap
@@ -126,6 +126,8 @@
 
 Christian Gmeiner <christian.gmeiner@gmail.com> <christian.GMEINER@bachmann.info>
 
+Christian Inci <chris.bugsfd@broke-the-inter.net> <chris.pcguy.inci@gmail.com>
+
 Christian König <christian.koenig@amd.com> Christian Koenig <christian.koenig@amd.com>
 Christian König <christian.koenig@amd.com> Christian König <christian.koenig at amd.com>
 Christian König <christian.koenig@amd.com> Christian König <deathsimple@vodafone.de>