Fix logic for absolute/relative argv[0] when constructing executable path.
Fix logic for absolute/relative argv[0] when constructing executable path.

Do not call path_isabsolute() in condition -- it always returns 1 and modifies the stack.
If argv[0] is already absolute, push it in the stack alone.

noresources/premake-core,noresources/premake-core,noresources/premake-core,noresources/premake-core,Zefiros-Software/premake-core,dcourtois/premake-core,soundsrc/premake-core,tvandijck/premake-core,sleepingwit/premake-core,dcourtois/premake-core,Zefiros-Software/premake-core,TurkeyMan/premake-core,premake/premake-core,mandersan/premake-core,mandersan/premake-core,mandersan/premake-core,dcourtois/premake-core,LORgames/premake-core,tvandijck/premake-core,sleepingwit/premake-core,TurkeyMan/premake-core,noresources/premake-core,starkos/premake-core,premake/premake-core,TurkeyMan/premake-core,starkos/premake-core,premake/premake-core,premake/premake-core,premake/premake-core,starkos/premake-core,premake/premake-core,noresources/premake-core,tvandijck/premake-core,noresources/premake-core,LORgames/premake-core,LORgames/premake-core,starkos/premake-core,starkos/premake-core,tvandijck/premake-core,Zefiros-Software/premake-core,TurkeyMan/premake-core,sleepingwit/premake-core,starkos/premake-core,tvandijck/premake-core,dcourtois/premake-core,sleepingwit/premake-core,LORgames/premake-core,Zefiros-Software/premake-core,soundsrc/premake-core,LORgames/premake-core,premake/premake-core,soundsrc/premake-core,sleepingwit/premake-core,dcourtois/premake-core,dcourtois/premake-core,soundsrc/premake-core,starkos/premake-core,mandersan/premake-core,dcourtois/premake-core,TurkeyMan/premake-core,Zefiros-Software/premake-core,soundsrc/premake-core,mandersan/premake-core