boost.build needs fixes for HP/UX

[oliver_kowalke]

Hello,
I'm using boost on HP/UX (11.11 PA-RISC) with gcc (3.4.4).

The default build for boost needs to be fixed for this
platform!

1.) -fPIC: Shared libraries must be build as 
position-independent code (HP/UX linker requires this)
on HP/UX!

2.) On HP/UX the extension *.sl is common for shared
libraries -> boosts default is *.so (my UNIX-Admin
was m 	irritated be *.so).
Do not use "-sSUFDLL=.sl"!!! This generates libraries
which will fail during load (for instance signals
library). I was able to reproduce this behaviour.

Oliver