v0.7.0:

This minor release follows the initial release of sltdl alongside
several corresponding fixes to and enhancements in slibtool.m4 and
the slibtoolize command execution mode.

To seamlessly use slibtool as a libtool drop-in replacement with projects
that utilize the ltdl interfaces, it is recommended that you first install
sltdl (obtain a release tarball from dl.foss21.org/sltdl/, or otherwise
clone the git repository from https://git.foss21.org/cross/sltdl), and
then _autoreconf_ the source tree of the project being built. For further
details, please see sltdl's initial release notes.

- driver: slbt_get_lconf_flags(): also parse the sltdl preference option.
- driver: slbt_output_config_mkvars(): also export the sltdl preference option.
- driver: slibtoolize mode: added 'libtoolize' as a synonym for 'slibtoolize'.
- driver: --prefer-sltdl: implementation and link-mode integration.
- slibtoolize: slbt_stoolie_options[]: fix typo.
- slibtoolize: prefer libsltdl unless invoked with the --system-ltdl argument.
- slibtoolize: reimplement --system-ltdl by way of an informative tag file.
- slibtool.m4: fix embedding of the SLIBTOOL_SYSROOT & SLIBTOOL_FLAGS variables.
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