Shared libs on OSX

[Per Persson]

Hi,
I've been looking into the issue of building shared libs for OS X and 
have made some progress.
Some of the problems with dynamic linking (as reported before) persist, 
but I've been able to run a version octave built with shared libs.
This was accomplished using a yet-to-be-released version of Apples gcc 
(v3.3 build 1301).

One thing that will need to be changed in the Makefiles is with repect 
to the SH_LD and SH_LDFLAGS.

In Mach-O objects there is a difference between a shared library 
(dylib) and a loadable module (.oct in this case). A dylib is used for 
linking either statically or shared from, but _not_ dynamically as 
opposed to ELF where I it is my understanding that a shared lib (.so) 
can be used for both shared and dynamic loading(?).

Hence, I'd like to split SH_LD and SH_LDFLAGS into SH_LD, SH_LDFLAGS, 
DL_LD and DL_LDFLAGS where the default is DL_LD=SH_LD and 
DL_LDFLAGS=SH_LDFLAGS for systems other than OS X.

I've attached a patch with the changes so you can comment on the 
suggestion.

/Per

osx_shared
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