[gnome-shell-extensions] build: Switch to js68 for tests

[Florian Müllner <fmuellner src gnome org>]

commit 7d5c985004e361037870b00b17aad85850baf6fe
Author: Florian Müllner <fmuellner gnome org>
Date:   Sat Mar 7 23:06:54 2020 +0100

    build: Switch to js68 for tests
    
    It's what the cool kids use nowadays ...

 extensions/meson.build | 4 ++--
 meson.build            | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/extensions/meson.build b/extensions/meson.build
index d1bf92c..ed7a2ed 100644
--- a/extensions/meson.build
+++ b/extensions/meson.build
@@ -33,11 +33,11 @@ install_data (extension_schemas,
 )
 
 foreach js_source : js_sources
-  if (js60.found())
+  if (js68.found())
     path_array = '@0@'.format(js_source).split('/')
     name = join_paths(path_array[-2], path_array[-1])
 
-    test('Checking syntax of ' + name, js60,
+    test('Checking syntax of ' + name, js68,
       args: ['-s', '-c', js_source],
       workdir: meson.current_source_dir()
     )
diff --git a/meson.build b/meson.build
index 918714f..a59de83 100644
--- a/meson.build
+++ b/meson.build
@@ -20,7 +20,7 @@ schemadir = join_paths(datadir, 'glib-2.0', 'schemas')
 sessiondir = join_paths(datadir, 'gnome-session', 'sessions')
 xsessiondir = join_paths(datadir, 'xsessions')
 
-js60 = find_program('js60', required: false)
+js68 = find_program('js68', required: false)
 
 ver_arr = meson.project_version().split('.')
 if ver_arr[1].to_int().is_even()