[mtasc] feature request: conditional compiling

[rsaccon at fastmail.fm]

Hi all

I started to mess around with AS2 and and because my project runs inside 
different containers (embedded into an application and also normal 
flashclips for the web) my sourcefiles for the different targets look a 
bit different, you can compare the situation to cross-compiling C/C++ 
for different OS. The perfect solution for me would be to have #ifdef,  
#else  and #endif statements in my code. The condition variables  then 
could be passed to the compiler as arguments, as in C/C++.

regards
rob