Ice 1.2.0 Linux build patch

[bernard]

The attached patch provides:
- an improved INSTALL.LINUX, with the proper Berkeley DB instructions
- better support for NPTL on RedHat 9
- support for the Intel C++ 8.0 compiler

To apply it on a fresh Ice 1.2.0 source distribution:
$ cd [Ice directory]
$ patch -p0 < [unzipped patch-file]

for example:
$ cd ~/Ice-1.2.0
$ patch -p0 < ../patch

Cheers,
Bernard