Update mscorlib.js
Update mscorlib.js

In the case of a Web Worker, window is undefined, in which case set window to the Web Worker's 'global scope' self.
erik-kallen/SaltarelleCompiler,n9/SaltarelleCompiler,ayo10/SaltarelleCompiler,AstrorEnales/SaltarelleCompiler,ProdigySim/SaltarelleCompiler,AstrorEnales/SaltarelleCompiler,enginekit/SaltarelleCompiler,enginekit/SaltarelleCompiler,x335/SaltarelleCompiler,x335/SaltarelleCompiler,Saltarelle/SaltarelleCompiler,ProdigySim/SaltarelleCompiler,ayo10/SaltarelleCompiler,ProdigySim/SaltarelleCompiler,erik-kallen/SaltarelleCompiler,Saltarelle/SaltarelleCompiler,n9/SaltarelleCompiler