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.
Each thread or virtual "process" that is launched on the emulator gets a 1 MB
stack. 1MB is much too large and 512 KB is more than sufficient. This
reduction in stack size will help the emulator to fit into Windows virtual
address space and improve its performance.