package/libtool: reduce target package to libltdl only

This will save 1700K on target filesystem (as tested on ARM, i686).

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libtool/libtool.mk

@@ -7,12 +7,22 @@
 LIBTOOL_VERSION = 2.4.6
 LIBTOOL_SOURCE = libtool-$(LIBTOOL_VERSION).tar.xz
 LIBTOOL_SITE = $(BR2_GNU_MIRROR)/libtool
+
+# For the target variant, we only want to build/install libltdl
+LIBTOOL_SUBDIR = libltdl
+HOST_LIBTOOL_SUBDIR = .
+
 LIBTOOL_INSTALL_STAGING = YES
-LIBTOOL_CONF_ENV = HELP2MAN=true
+
+LIBTOOL_CONF_OPTS = --enable-ltdl-install
+
 LIBTOOL_DEPENDENCIES = host-m4
 HOST_LIBTOOL_DEPENDENCIES = host-m4
-LIBTOOL_LICENSE = GPL-2.0+
-LIBTOOL_LICENSE_FILES = COPYING
+
+LIBTOOL_LICENSE = LGPL-2.1+
+LIBTOOL_LICENSE_FILES = $(LIBTOOL_SUBDIR)/COPYING.LIB
+HOST_LIBTOOL_LICENSE = GPL-2.0+ (libtool), LGPL-2.1+ (libltdl)
+HOST_LIBTOOL_LICENSE_FILES = COPYING $(LIBTOOL_SUBDIR)/COPYING.LIB
 
 HOST_LIBTOOL_CONF_ENV = MAKEINFO=true
 HOST_LIBTOOL_LIBTOOL_PATCH = NO