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Porting inter-library dependencies support

Since version 1.2c, libtool has re-introduced the ability to do inter-library dependency on some platforms, thanks to a patch by Toshio Kuratomi badger@prtr-13.ucsc.edu. Here's a shortened version of the message that contained his patch:

The basic architecture is this: in `libtool.m4', the person who writes libtool makes sure `$deplibs' is included in `$archive_cmds' somewhere and also sets the variable `$deplibs_check_method', and maybe `$file_magic_cmd' when `deplibs_check_method' is file_magic.

`deplibs_check_method' can be one of five things:

`file_magic [regex]'

looks in the library link path for libraries that have the right libname. Then it runs `$file_magic_cmd' on the library and checks for a match against regex using egrep. When file_magic_test_file is set by `libtool.m4', it is used as an argument to `$file_magic_cmd' in order to verify whether the regular expression matches its output, and warn the user otherwise.

`test_compile'

just checks whether it is possible to link a program out of a list of libraries, and checks which of those are listed in the output of ldd. It is currently unused, and will probably be dropped in the future.

`pass_all'

will pass everything without any checking. This may work on platforms in which code is position-independent by default and inter-library dependencies are properly supported by the dynamic linker, for example, on DEC OSF/1 3 and 4.

`none'

It causes deplibs to be reassigned deplibs="". That way `archive_cmds' can contain deplibs on all platforms, but not have deplibs used unless needed.

`unknown'

is the default for all systems unless overridden in `libtool.m4'. It is the same as `none', but it documents that we really don't know what the correct value should be, and we welcome patches that improve it.

Then in `ltmain.in' we have the real workhorse: a little initialization and postprocessing (to setup/release variables for use with eval echo libname_spec etc.) and a case statement that decides which method is being used. This is the real code... I wish I could condense it a little more, but I don't think I can without function calls. I've mostly optimized it (moved things out of loops, etc) but there is probably some fat left. I thought I should stop while I was ahead, work on whatever bugs you discover, etc before thinking about more than obvious optimizations.

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