Revert "package/libs/libtool: rename to libltdl"

This reverts commit r48149

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 48169

package/libs/libtool/Makefile

@@ -11,7 +11,6 @@ PKG_NAME:=libtool
 PKG_VERSION:=2.4
 PKG_RELEASE:=1
 
-PKG_BUILD_DIR:=$(BUILD_DIR)/libltdl/$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@GNU/libtool
 PKG_MD5SUM:=b32b04148ecdd7344abc6fe8bd1bb021