libtool: preliminary support for tcc on linux*.

* m4/libtool.m4 (_LT_LINKER_SHLIBS) <linux*>: Set archive_cmds and
ld_shlibs appropriately when using tcc.
* NEWS: Update.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
libtool: -rdynamic support for tcc.

* m4/libtool.m4 (_LT_LINKER_SHLIBS) <linux*>: Set
export_dynamic_flag_spec appropriately when using tcc.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
tests: set bindir and libdir at configure time.

In particular, openSuSE on x86_64 uses CONFIG_SITE to set libdir
to "${exec_prefix}/lib64", which confuses testcases that check
the contents of "${prefix}/lib".  In general, tests that expect
to find installed files in specific directories should explicitly
set those directories at configure time.
* tests/testsuite.at (LT_AT_CONFIGURE): Make sure exec_prefix,
bindir and libdir point to known subdirectories we can check the
contents of later on in a test case.
(prefixdir): Rename from this...
(prefix): ...to this.  All test cases that set or use the config
prefix directory must now refer to `prefixdir` for the helper
macros in this file to work in hostile build environments such
as CONFIG_SITE setting openSuSE.
* tests/demo.at, tests/depdemo.at, tests/mdemo.at,
tests/tagdemo.at: Adjust accordingly.
Reported by Peter Breitenlohner.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
libtoolize: do not remove gnulib files with --force.

* libtoolize.in (func_require_seen_libtool): Do not remove
snippet/* files which are from Gnulib.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
maint: whitespace cleanup.

* Makefile.am ($(thanks)): Fix several whitespace syntax-check
failures.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
libltdl: move libltdl argz module into LT namespace.

To avoid clashes with gnulib argz module in ltdl client projects,
move ours into its own namespace.
* libltdl/argz_.h, libltdl/argz.c, m4/argz.m4: Move from here...
* libltdl/libltdl/lt__argz_.h, libltdl/lt__argz.c, m4/ltargz.m4:
...to here.
* Makefile.am, libltdl/libltdl/lt__glibc.h, libltdl/ltdl.mk,
libtoolize.in, m4/ltdl.m4: Adjust accordingly.
* tests/libtoolize.at, tests/ltdl-api.at, tests/nonrecursive.at,
tests/old-ltdl-iface.at: Adjust for different libtoolize output.
* libltdl/.gitignore: Adjust accordingly.
* NEWS: Update.
Reported by Pavel Raiskup

Signed-off-by: Gary V. Vaughan <gary@gnu.org>