[gimp] Fix INSTALL.in

[Michael Schumacher <schumaml src gnome org>]

commit 36d6896a9234790e01166c522eda9d3421fcf2df
Author: Félix Piédallu <felix piedallu me>
Date:   Sun Aug 25 21:46:58 2019 +0200

    Fix INSTALL.in

 INSTALL.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/INSTALL.in b/INSTALL.in
index 2dd6453c46..f083b7abbd 100644
--- a/INSTALL.in
+++ b/INSTALL.in
@@ -187,7 +187,7 @@ header files installed.
      libxpm              -              XPM
      openexr             @OPENEXR_REQUIRED_VERSION@          OpenEXR
      OpenJPEG            @OPENJPEG_REQUIRED_VERSION@          JPEG 2000
-     python 2            @PYTHON2_REQUIRED_VERSION@          Python plug-ins
+     python 3            @PYTHON3_REQUIRED_VERSION@          Python plug-ins
      webkit              @WEBKITGTK_REQUIRED_VERSION@         Help browser & webpage
 
  21. Summary of optional runtime dependencies: