[8/11] Native MSVC support (dashl-xform)

[Peter Rosin]

MSVC doesn't support the -l option, instead it expects the exact library
file name. Retain the -l option as long as possible as libtool
recognizes -l internally. Then, as late as possible transform the -l
option to an exact file name (-lfoo -> foo.lib).

        * libltdl/m4/libtool.m4: Add tag variable dashl_xform which
        specifies how to transform -l options for the linker.
        * libltdl/config/ltmain.m4sh (func_mode_link): Transform -l
        options using dashl_xform right before creating the
        program or library.

dashl-xform.patch
Description: Text document