Configuration patches to handle threading and general tuning issues

[Gabriel Dos Reis]

"John David Anglin" <dave@hiauly1.hia.nrc.ca> writes:

[...]

| 26_numerics/c99_classification_macros_c.cc FAIL:
| 
| /xxx/gnu/gcc-3.0/libstdc++-v3/testsuite/26_numerics/fabs_inline.cc:28: `fabs'
|    is already declared in this scope

There is a patch for this.  I'm waiting for Benjamin completing his
checkin before applying mine.

-- Gaby