Add explicit character encoding specifications in 39 more RGL modules

To silence warnings and avoid potential problems after changing the default
encoding to UTF-8.

lib/src/dutch/ExtraDutAbs.gf

@@ -5,7 +5,7 @@ abstract ExtraDutAbs = Extra [
   VV,VP,Conj,IComp,ICompAP,IAdvAdv,Adv,AP,IAdv,
   VPSlash, NominalizeVPSlashNP] ** 
 {
-
+  flags coding=utf8;
 --{
 --
 --  fun

lib/src/dutch/IrregDutAbs.gf

@@ -1,3 +1,4 @@
+--# -coding=latin1
 abstract IrregDutAbs = Cat ** {
 
 fun bakken_V : V ; -- to fry