Outdated libtool creates trouble on macOS

[FX Coudert]

> No problem, I’ll continue to post small batches of changes here when I get some time.

Fourth patch in the series, dealing with win32 DLL’s. You said you had issues with this before, I implemented the changes recommended by the manual (and did not use autoupdate, which is not always reliable in my experience).

From the generated files, it seems OK: the only effect is a change in the position of some code. Still, it needs to be tested on Windows, and I don’t have access to such machines. If there are failures, an alternative would be to move up the call to "LT_INIT([win32-dll])” to where AC_LIBTOOL_WIN32_DLL previously was called.

Best,
FX


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PS: for the record, after this is done, only the following remain:

warning: back quotes and double quotes must not be escaped in: $as_me:${as_lineno-$LINENO}: WARNING: the \"none\" host is obsolete, use --disable-assembly
warning: back quotes and double quotes must not be escaped in: $as_me: WARNING: the \"none\" host is obsolete, use --disable-assembly
warning: AC_OUTPUT should be used without arguments.
warning: AC_PROG_LEX without either yywrap or noyywrap is obsolete

warning: The macro `AC_TRY_COMPILE' is obsolete.
warning: The macro `AC_TRY_LINK' is obsolete.
warning: The macro `AC_TRY_RUN' is obsolete.