fixes issue 857 + clear final argv and add fake env var for proper stack setup
fixes issue 857
+ clear final argv and add fake env var for proper stack setup

also switched from strcpy to memmove for arg shift as there can be overlap

SVN-Revision: 1504

code4bones/dynamorio,daksunt/dynamorio,code4bones/dynamorio,sigma-random/dynamorio,daksunt/dynamorio,bl4ckic3/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,sigma-random/dynamorio,AmesianX/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,sigma-random/dynamorio,sigma-random/dynamorio,daksunt/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,bl4ckic3/dynamorio