fix native clean; build GnuR with --enable-R-shlib

com.oracle.truffle.r.native/gnur/Makefile

@@ -39,11 +39,11 @@ all: Makefile $(GNUR_DIR) config build copy
 
 $(GNUR_DIR): 
 	tar xf $(TOPDIR)/../lib/R-$(R_VERSION).tar.gz
-	
+
 config: $(GNUR_DIR)/Makefile
 
 $(GNUR_DIR)/Makefile: 
-	(cd $(GNUR_DIR); ./configure --with-x=no --without-recommended-packages >& /dev/null)
+	(cd $(GNUR_DIR); ./configure --with-x=no --without-recommended-packages --enable-R-shlib >& /dev/null)
 
 build: $(GNUR_DIR)/bin/R
 

com.oracle.truffle.r.native/library/lib.mk

@@ -87,6 +87,6 @@ $(OBJ)/%.o: $(SRC)/%.f
 	$(FC) $(CFLAGS) -c $< -o $@
 
 clean: 
-	rm -f $(LIBDIR)/*
+	rm -rf $(LIBDIR)/*
 	rm -rf $(FASTR_LIBDIR)/$(PKG)