[gimp] plug-ins: (meson) install Python plug-ins with execution permission.

[Jehan <jehanp src gnome org>]

commit e54467a8fa5cbb3b012915fa0f771e611e354aff
Author: Jehan <jehan girinstud io>
Date:   Tue Nov 26 20:24:28 2019 +0100

    plug-ins: (meson) install Python plug-ins with execution permission.
    
    Otherwise GIMP will skip them!

 plug-ins/python/meson.build | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/plug-ins/python/meson.build b/plug-ins/python/meson.build
index 56790e6f6f..d3d391df36 100644
--- a/plug-ins/python/meson.build
+++ b/plug-ins/python/meson.build
@@ -31,7 +31,8 @@ foreach plugin : plugins
   name = plugin.get('name')
   srcs = plugin.get('srcs', name + '.py')
 
-  install_data(srcs, install_dir: gimpplugindir / 'plug-ins' / name)
+  install_data(srcs, install_dir: gimpplugindir / 'plug-ins' / name,
+               install_mode: 'r-xr-xr-x')
 endforeach