vchoi_fork

[svn-r9809] Purpose: bug fix

Description:  For HP-UX11.00, compiler's casting from 'long double' to most of
integers.  A macro was hard set in config/hpux11.00 before.

Solution:  Let configure detect this case and set the macro.

Platforms tested:  kelgia, fuss, modi4.  These systems are mainly concerned.