please stop excluding build on i686, at least for system-shared linking

[jonassmedegaard]

Makefile.PL contains this:

if($Config{archname} =~ /686/) {
    warn "liblmdb isn't supported in your platform, sorry.\n";
    exit 0;
}                                   

But liblmdb evidently builds fine on 32-bit archs including i686: https://buildd.debian.org/status/package.php?p=liblmdb-file-perl

Please drop that check - or at least adapt it to only apply for locally compiling library, not for pre-compiled system-shared library which if it exists obviously is possible.