Fixed: 'cannot run program "ulimit"' error.
Fixed: 'cannot run program "ulimit"' error.

When running on certain platforms the `ulimit` command is not available, which would crash the build script.

This change simply refrains from using the `ulimit` command if it's not available.

wangshijin/cappuccino,daboe01/cappuccino,mrcarlberg/cappuccino,krodelin/cappuccino,deltaprojects/cappuccino,cappuccino/cappuccino,deltaprojects/cappuccino,mrcarlberg/cappuccino,primalmotion/cappuccino,daboe01/cappuccino,wangshijin/cappuccino,rgv151/cappuccino,deltaprojects/cappuccino,rgv151/cappuccino,tancred/cappuccino,tancred/cappuccino,cacaodev/cappuccino,cacaodev/cappuccino,tancred/cappuccino,krodelin/cappuccino,cappuccino/cappuccino,cacaodev/cappuccino,kidaa/cappuccino,rgv151/cappuccino,rgv151/cappuccino,FrankReh/cappuccino,rgv151/cappuccino,koamac/Cappuccino,zittix/cappuccino,deltaprojects/cappuccino,rgv151/cappuccino,tancred/cappuccino,primalmotion/cappuccino,wangshijin/cappuccino,deltaprojects/cappuccino,koamac/Cappuccino,AlexanderMazaletskiy/cappuccino,Dogild/cappuccino,cacaodev/cappuccino,FrankReh/cappuccino,FrankReh/cappuccino,kidaa/cappuccino,zittix/cappuccino,cacaodev/cappuccino,AlexanderMazaletskiy/cappuccino,Dogild/cappuccino,Dogild/cappuccino,Rosch/cappuccino,tancred/cappuccino,FrankReh/cappuccino,koamac/Cappuccino,koamac/Cappuccino,Dogild/cappuccino,cappuccino/cappuccino,Rosch/cappuccino,cappuccino/cappuccino,primalmotion/cappuccino,deltaprojects/cappuccino,mrcarlberg/cappuccino,krodelin/cappuccino,Dogild/cappuccino,cacaodev/cappuccino,FrankReh/cappuccino,FrankReh/cappuccino,tancred/cappuccino,koamac/Cappuccino,kidaa/cappuccino,daboe01/cappuccino,mrcarlberg/cappuccino,wangshijin/cappuccino,krodelin/cappuccino,primalmotion/cappuccino,cappuccino/cappuccino,zittix/cappuccino,mrcarlberg/cappuccino,kidaa/cappuccino,koamac/Cappuccino,FrankReh/cappuccino,mrcarlberg/cappuccino,enquora/cappuccino,Rosch/cappuccino,kidaa/cappuccino,mrcarlberg/cappuccino,cappuccino/cappuccino,deltaprojects/cappuccino,daboe01/cappuccino,primalmotion/cappuccino,enquora/cappuccino,cappuccino/cappuccino,enquora/cappuccino,Rosch/cappuccino,krodelin/cappuccino,krodelin/cappuccino,zittix/cappuccino,enquora/cappuccino,zittix/cappuccino,primalmotion/cappuccino,Rosch/cappuccino,mrcarlberg/cappuccino,AlexanderMazaletskiy/cappuccino,daboe01/cappuccino,AlexanderMazaletskiy/cappuccino,cacaodev/cappuccino,zittix/cappuccino,daboe01/cappuccino,primalmotion/cappuccino,daboe01/cappuccino,Dogild/cappuccino,enquora/cappuccino,AlexanderMazaletskiy/cappuccino,AlexanderMazaletskiy/cappuccino,enquora/cappuccino,Rosch/cappuccino,rgv151/cappuccino,zittix/cappuccino,Rosch/cappuccino,krodelin/cappuccino,FrankReh/cappuccino,wangshijin/cappuccino,enquora/cappuccino,kidaa/cappuccino,wangshijin/cappuccino,Dogild/cappuccino