1) fix_tools_exports.pl need only be run on Windows hosts; was run unnecessarily on Linux too.
2) Need to export modload.pm on Linux as well as Windows hosts.
Qt needs to be able to have more than one active exception object, even when
OOM (out-of-memory).
A detailed overview of the solution can be found at
http://wikis.in.nokia.com/Toolchain/QtExceptionHandling
In short, we add a new MMP flag keyword - EPOCNESTEDEXCEPTIONS. When this
keyword is specified, a different static run-time library is used.