btrfs-progs: use $(LN) macro, bump release

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

utils/btrfs-progs/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=btrfs-progs
 PKG_VERSION:=3.19.1
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-v$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@KERNEL/linux/kernel/people/kdave/btrfs-progs/
@@ -57,7 +57,7 @@ define Package/btrfs-progs/install
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/lib/libbtrfs.so* $(1)/usr/lib
 	$(INSTALL_DIR) $(1)/usr/bin
 	$(INSTALL_BIN) $(addprefix $(PKG_INSTALL_DIR)/usr/bin/, $(progs)) $(1)/usr/bin/
-	ln -s btrfs $(1)/usr/bin/btrfsck
+	$(LN) btrfs $(1)/usr/bin/btrfsck
 	$(INSTALL_DIR) $(1)/etc/init.d
 	$(INSTALL_BIN) ./files/btrfs-scan.init $(1)/etc/init.d/btrfs-scan
 endef