stack base on Mac OS X

[Andreas Vögele]

The stack base problem on Mac OS X can easily be fixed by using the 
preprocessor macros __APPLE__ and __MACH__ instead of the macro macosx, 
which is not defined by GCC on Mac OS X.

Hans Boehm's garbage collector now also uses __APPLE__ and __MACH__ and 
Apple's documentation says "To define a section of code to be compiled 
on Mac OS X system you should define a section using __APPLE__ with 
__MACH__ macros.". See 
http://developer.apple.com/technotes/tn2002/tn2071.html#Section10 for 
details.

The attached patch updates the preprocessor directives in gc_os_dep.c.  
The patch also separates the definition of the variable result in 
scm_get_stack_base() from the variable initialisation. If the 
definition and the initialisation are not separated GCC 3.3 complains 
about an unused variable on Mac OS X and HP-UX.

gc_os_dep.c.diff.c
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