when making links, if the link already exists as a directory, remove the directory first

SheepShaver/Makefile

@@ -99,7 +99,8 @@ links:
 	    echo $$i; o=$$i; \
 	    case $$i in *codegen_x86.h) o=kpx_cpu/src/cpu/jit/x86/codegen_x86.h;; esac; \
 	    SUB=`echo $$o | sed 's;[^/]*/;../;g' | sed 's;[^/]*$$;;'` ;\
-	    ln -sf "$$PREFIX$$SUB$(B2_TOPDIR)/src/$$i" src/$$o; \
+	    cur_link=src/$$o ;\
+	    if [ -d "$$cur_link" ]; then rm -rf "$$cur_link"; fi ;\
+	    ln -sf "$$PREFIX$$SUB$(B2_TOPDIR)/src/$$i" $$cur_link; \
 	  fi; \
-	done; \
-	ln -sf ../../../../../SheepShaver/src/Unix/config.h $(B2_TOPDIR)/src/Unix/Linux/NetDriver/config.h
+	done;