Prob w/ C_decode_seconds on MacOS X 10.4

Hi Felix,

In the old system 'timezone' was a procedure. So the runtime.c  
C_decode_seconds procedure returns the address of the procedure for  
the timezone offset! Here is a patch:

7632a7633,7635
> #ifdef C_MACOSX
>                 C_fix(tmt->tm_gmtoff) );
> #else
7633a7637
> #endif

Note: MacOS X 10.4 is SUS3 compatible but requires the  
__DARWIN_UNIX03 macro be defined as 1 before including any headers  
(so define on the compiler command line). I didn't do this for  
compatibility w/  10.3, and the decode_seconds problem is the only  
one so far. (?!)

I can experiment w/ a SUS3 build, where the 'timezone' variable would  
used, for example. But, as in previous message I think this Q&D chg  
is sufficient.

Best Wishes,
Kon