switch to using a windows command instead of a 'unix-like' command fo… #308

Job	Run time
l10n	26s
zip up the rules directory	1m 8s
Build 64 bit windows pyd file	3m 47s
Build 32 bit windows pyd file	4m 17s
Build linux pyd file (64-bit intel)	1m 49s
build-addon	0s
Pre Release	-1s
	11m 26s

Provide feedback