Doxygen: gitignore generated files for libosmoctrl

Change-Id: Ia888d14c6e1f76374addd9b1ee66523f82fc06c9
diff --git a/.gitignore b/.gitignore
index db17535..369277c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,6 +34,7 @@
 *-libtool
 
 Doxyfile.core
+Doxyfile.ctrl
 Doxyfile.gsm
 Doxyfile.vty
 Doxyfile.codec
@@ -71,6 +72,7 @@
 doc/codec
 doc/coding
 doc/core
+doc/ctrl
 doc/vty/latex
 doc/vty/html
 doc/vty/doxygen_sqlite3.db