[gexiv2] doc: Also scan the cpp source files

[Jens Georg <jensgeorg src gnome org>]

commit 22059e4c0d79315c107205722fedf402b592e6f6
Author: Jens Georg <mail jensge org>
Date:   Sun Mar 5 18:12:52 2017 +0100

    doc: Also scan the cpp source files
    
    Signed-off-by: Jens Georg <mail jensge org>

 docs/reference/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/reference/Makefile.am b/docs/reference/Makefile.am
index 953b01f..dbe549d 100644
--- a/docs/reference/Makefile.am
+++ b/docs/reference/Makefile.am
@@ -27,7 +27,7 @@ SCAN_OPTIONS=
 
 # Extra options to supply to gtkdoc-mkdb
 # e.g. MKDB_OPTIONS=--xml-mode --output-format=xml
-MKDB_OPTIONS=--xml-mode --output-format=xml
+MKDB_OPTIONS=--xml-mode --output-format=xml --source-suffixes=h,c,cpp
 
 # Extra options to supply to gtkdoc-mkhtml
 MKHTML_OPTIONS=