[gnome-photos] operation-svg-multiply: Restore attribution

[Debarshi Ray <debarshir src gnome org>]

commit 3229d6e6e611fa05d342e4409e2f167947f854a2
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Jul 19 07:10:47 2017 +0200

    operation-svg-multiply: Restore attribution
    
    The photos:svg-multiply operation is based on the one that used to be
    in GEGL.

 src/photos-operation-svg-multiply.c |    4 ++++
 src/photos-operation-svg-multiply.h |    4 ++++
 2 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-operation-svg-multiply.c b/src/photos-operation-svg-multiply.c
index e1a2394..e1c656c 100644
--- a/src/photos-operation-svg-multiply.c
+++ b/src/photos-operation-svg-multiply.c
@@ -18,6 +18,10 @@
  * 02110-1301, USA.
  */
 
+/* Based on code from:
+ *   + GEGL
+ */
+
 
 #include "config.h"
 
diff --git a/src/photos-operation-svg-multiply.h b/src/photos-operation-svg-multiply.h
index 0aa0357..95d8392 100644
--- a/src/photos-operation-svg-multiply.h
+++ b/src/photos-operation-svg-multiply.h
@@ -18,6 +18,10 @@
  * 02110-1301, USA.
  */
 
+/* Based on code from:
+ *   + GEGL
+ */
+
 #ifndef PHOTOS_OPERATION_SVG_MULTIPLY_H
 #define PHOTOS_OPERATION_SVG_MULTIPLY_H