[gimp] icons: use argv chain of ops instead of xml to express inverting graph

[Øyvind Kolås <ok src gnome org>]

commit 2da8aadfe221443c449e41229c5572d0b0086c25
Author: Øyvind Kolås <pippin gimp org>
Date:   Mon Mar 7 11:48:14 2016 +0100

    icons: use argv chain of ops instead of xml to express inverting graph

 icons/Symbolic-Inverted/Makefile.am |   11 +----------
 1 files changed, 1 insertions(+), 10 deletions(-)
---
diff --git a/icons/Symbolic-Inverted/Makefile.am b/icons/Symbolic-Inverted/Makefile.am
index 79abb71..0019b4e 100644
--- a/icons/Symbolic-Inverted/Makefile.am
+++ b/icons/Symbolic-Inverted/Makefile.am
@@ -44,16 +44,7 @@ scalable/%.svg: ../Symbolic/scalable/%.svg ../../tools/invert-svg
 # But it doesn't. If someone knows how, feel free to fix it back into
 # a single rule.
 
-MAKE_ICON = mkdir -p `dirname $ `; \
-       $(GEGL) -x \
-       "<gegl> \
-         <node operation='gegl:invert-gamma'></node> \
-         <node operation='gegl:load'> \
-           <params> \
-             <param name='path'>$<</param> \
-           </params> \
-         </node> \
-       </gegl>" -o $@
+MAKE_ICON = mkdir -p `dirname $ `; $(GEGL) $< -o $@ -- gegl:invert-gamma
 
 12/%.png: $(top_srcdir)/icons/Symbolic/12/%.png
        $(MAKE_ICON)