Libtool head: Fix for -mode=clean on Cygwin/MinGW

[Peter Ekberg]

Hi!

If you use libtool -mode=clean on an uninstalled .la lib on
Cygwin (or MinGW I assume), not all associated files are
cleaned out. The reason is as follows; an uninstalled .la
typically looks like this on Cygwin:

-------
# liba.la - a libtool library file
# Generated by ltmain.sh (GNU libtool 1.2076 2005/09/16 08:33:22) 2.1a
#
# Please DO NOT delete this file!
# It is necessary for linking the library.

# The name that we can dlopen(3).
dlname='cyga-0.dll'

# Names of this library.
library_names='liba.dll.a'

# The name of the static archive.
old_library='liba.a'

etc...
-------

Clean only removes files in $library_names and $old_library, so
cyga-0.dll is left behind.

Ok to apply?

        * libltdl/config/ltmain.m4sh (func_mode_uninstall): Clean
        up $dlname as well when cleaning a libtool library. Fixes
        -mode=clean on Cygwin and MinGW to actually remove the dll
        when cleaning up an uninstalled library.

Ps. For -mode=uninstall, the dll is zapped by a custom
$postuninstall_cmds.

Cheers,
Peter

head-clean-dlname.patch
Description: head-clean-dlname.patch