[gimp] tools: add invert-svg.c in the distribution.

[Jehan Pagès <jehanp src gnome org>]

commit c8068d9e7e609e47adc9667209218091046b93c5
Author: Jehan <jehan girinstud io>
Date:   Fri Mar 24 03:17:35 2017 +0100

    tools: add invert-svg.c in the distribution.
    
    Otherwise the file won't be included in the tarball (another consequence
    is that `make distcheck` will fail) since this binary is not made the
    common automake way on purpose.

 tools/Makefile.am |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/tools/Makefile.am b/tools/Makefile.am
index 699a546..73d9cb4 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -86,7 +86,8 @@ AM_CPPFLAGS = \
 EXTRA_DIST = \
        defcheck.py     \
        gimp-mkenums    \
-       gimppath2svg.py
+       gimppath2svg.py \
+       invert-svg.c
 
 # Build tools which must be built for the host platform.
 all: invert-svg$(BUILD_EXEEXT)