[PATCH] Fix libtool.m4 dlopen lookup for mingw

[Eli Zaretskii]

> Date: Tue, 27 Nov 2012 11:05:17 +0400
> From: Pavel Chupin <pavel.v.chupin@gmail.com>
> 
> Attached patch removes mingw from special cases of dlopen lookup. It
> allows dlopen to be found later in libdl and have it added properly as
> -ldl in bfd and sim builds.

What effect will this have on native builds, where both host and
target are MinGW?  Will it require to have libdl installed?  AFAIR, it
doesn't require that now.

If this problem only happens with this combination of host, target,
and build:

> ../configure --enable-plugins --target=arm-linux-android
> --host=i586-pc-mingw32msvc --build=i386-linux-gnu

then wouldn't it be better to fix only that combination?