package/libopenssl: use $(RM) instead of rm

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libopenssl/libopenssl.mk

@@ -135,8 +135,8 @@ endef
 
 define LIBOPENSSL_INSTALL_TARGET_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) DESTDIR=$(TARGET_DIR) install
-	rm -rf $(TARGET_DIR)/usr/lib/ssl
-	rm -f $(TARGET_DIR)/usr/bin/c_rehash
+	$(RM) -rf $(TARGET_DIR)/usr/lib/ssl
+	$(RM) -f $(TARGET_DIR)/usr/bin/c_rehash
 endef
 
 # libdl has no business in a static build
@@ -166,7 +166,7 @@ endif
 
 ifneq ($(BR2_PACKAGE_LIBOPENSSL_ENGINES),y)
 define LIBOPENSSL_REMOVE_LIBOPENSSL_ENGINES
-	rm -rf $(TARGET_DIR)/usr/lib/engines-1.1
+	$(RM) -rf $(TARGET_DIR)/usr/lib/engines-1.1
 endef
 LIBOPENSSL_POST_INSTALL_TARGET_HOOKS += LIBOPENSSL_REMOVE_LIBOPENSSL_ENGINES
 endif