bug#24574: emacs-module is not GPL compatible (Windows)

[Eli Zaretskii]

> Date: Sat, 1 Oct 2016 20:28:15 +0000 (UTC)
> From: Mambo Levis <mambo.levis@gmail.com>
> Cc: "a.s@realize.ch" <a.s@realize.ch>, 
>       "24574@debbugs.gnu.org" <24574@debbugs.gnu.org>
> 
> %.$(SO): %.o
> $(LD) -shared $(LDFLAGS) -o $@ $< sqlite3.lib
> [...]
> Please, notice that this time the plugin_is_GPL_compatible. The problem is 
> now that the module can't be
> found when a sqlite3.dll symbol is used.
> 
> Any Idea or suggestion?

Add -Wl,-export-all-symbols to LDFLAGS.