Fix two QVM bot syscalls in g_syscalls.asm

This was causing bad memory changes. The cvarTable in g_main.c is getting modified, and errored "Cvar_Update: handle out of range".
Fix QVM's trap_Alloc overlapping with vm program stack

trap_Alloc seems usable now, no more memory trashing.
Merge remote-tracking branch 'spearmint/master'