unbound: fix library double packing

Signed-off-by: Alexander Ryzhov <github@ryzhov-al.ru>

net/unbound/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=unbound
 PKG_VERSION:=1.9.1
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://nlnetlabs.nl/downloads/unbound
@@ -221,7 +221,7 @@ Package/unbound-daemon-heavy/install = $(Package/unbound-daemon/install)
 
 define Package/libunbound/install
 	$(INSTALL_DIR) $(1)/usr/lib
-	$(INSTALL_DATA) $(PKG_INSTALL_DIR)/usr/lib/libunbound.so.* $(1)/usr/lib/
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libunbound.so.* $(1)/usr/lib/
 endef
 
 Package/libunbound-heavy/install = $(Package/libunbound/install)