UPD: Use LC_CTYPE to determine locale under Linux

(cherry picked from commit e650495a5a2b113b2032c3f4de5bfc923855d6ae)

components/doublecmd/dcconvertencoding.pas

@@ -407,7 +407,7 @@ begin
   Lang:= SysUtils.GetEnvironmentVariable('LC_ALL');
   if Length(Lang) = 0 then
     begin
-      Lang:= SysUtils.GetEnvironmentVariable('LC_MESSAGES');
+      Lang:= SysUtils.GetEnvironmentVariable('LC_CTYPE');
       if Length(Lang) = 0 then
       begin
         Lang:= SysUtils.GetEnvironmentVariable('LANG');