Issue #12424: properly disable gjs requirement at build time

meson.build

@@ -1170,11 +1170,9 @@ MIMEtypes += 'image/openraster'
 
 ## Javascript
 
-gjs = find_program('gjs', required: get_option('javascript'))
+gjs = find_program('gjs', required: false)
 have_javascript = get_option('javascript').enabled() or (gjs.found() and get_option('javascript').auto())
 if not gjs.found() and have_javascript
-  gjs = find_program('gjs', required: false)
-  if not gjs.found()
   js_warning = '''
   GJS was not found.
   JavaScript plug-ins will be installed anyway but you should make sure that
@@ -1183,7 +1181,6 @@ if not gjs.found() and have_javascript
   '''
   warning(js_warning)
   warnings += js_warning
-  endif
 endif
 
 ## Lua