Optionally have ld(1) script instead of symlink for .so

[Jeremie Le Hen]

Hi,

I plan to commit the attached patch.  It brings a new variable for
library Makefiles (SHLIB_LDSCRIPT).  When defined, it contains the name
of a template file used to generate the ld(1) script.

Two variables may appear in the template file:
- @@SHLIB@@ will be substituted by the real shared library full path
  (${SHLIBDIR}/${SHLIB_NAME});
- @@LIBDIR@@ will be substituted with ${LIBDIR}.

This is wrapped with some cursed magic to allow building 32bits
libraries on 64bits platforms and cross-building.

This is the first step toward being able to build ports with SSP
painlessly.

Any comment or concern?
-- 
Jeremie Le Hen

Men are born free and equal.  Later on, they're on their own.
				Jean Yanne
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