two new cpu_limits files

[Gabriel Dos Reis]

rth@redhat.com writes:

| (1) IA-64 was missing a file entirely, so __glibcpp_long_bits was incorrect.  
| 
|     Actually, even this is incorrect for ia64-hpux.  I'll submit a 
|     proposed fix for this momentarily.
| 
| (2) The generic Alpha config file has __glibcpp_long_double_bits == 64,
|     which is incorrect for Tru64 5.x.

Thank you very much.

-- Gaby
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