libtool: Split out libltdl into separate package

packages/libtool/build.sh

@@ -2,8 +2,9 @@ TERMUX_PKG_HOMEPAGE=https://www.gnu.org/software/libtool/
 TERMUX_PKG_DESCRIPTION="Generic library support script hiding the complexity of using shared libraries behind a consistent, portable interface"
 TERMUX_PKG_DEPENDS="bash,grep,sed"
 TERMUX_PKG_VERSION=2.4.6
-TERMUX_PKG_BUILD_REVISION=3
+TERMUX_PKG_BUILD_REVISION=4
 TERMUX_PKG_SRCURL=https://mirrors.kernel.org/gnu/libtool/libtool-${TERMUX_PKG_VERSION}.tar.gz
+TERMUX_PKG_DEPENDS="libltdl"
 TERMUX_PKG_NO_DEVELSPLIT=yes
 TERMUX_PKG_CONFLICTS="libtool-dev"
 TERMUX_PKG_REPLACES="libtool-dev"

packages/libtool/libltdl.subpackage.sh

@@ -0,0 +1,2 @@
+TERMUX_SUBPKG_INCLUDE="lib/libltdl.so"
+TERMUX_SUBPKG_DESCRIPTION="Library for dlopening libraries"