Fix CP_UNITS_SRC variable for dotted case

rtl/inc/Makefile.rtl

@@ -537,7 +537,11 @@ CP_UNITS=$(CP1250UNIT) $(CP1251UNIT) $(CP1252UNIT) $(CP1253UNIT) $(CP1254UNIT) $
       $(CP8859_5UNIT) $(CP8859_6UNIT) $(CP8859_7UNIT) $(CP8859_8UNIT) $(CP8859_9UNIT) $(CP8859_10UNIT) $(CP8859_11UNIT) \
       $(CP8859_13UNIT) $(CP8859_14UNIT) $(CP8859_15UNIT) $(CP8859_16UNIT) $(CPKOI8_RUNIT) $(CPKOI8_UUNIT)
 
+ifdef FPC_DOTTEDUNITS
+CP_UNITS_SRC=$(addsuffix .pas,$(addprefix $(NSINC)/,$(CP_UNITS)))
+else
 CP_UNITS_SRC=$(addsuffix .pas,$(addprefix $(RTL)/charmaps/,$(CP_UNITS)))
+endif
 
 [install]
 fpcpackage=y