Test: Tested by following steps
1.m nothing: field is empty
2.USE_RBE=false m nothing: field log cc_wrapper and rbe_wrapper
3.USE_RBE=false m nothing: field is empty
Bug: 281922291
Change-Id: I1bbb324752b9a2dea1ff2c9df5817559d4cec3a6
This lets one avoid any decisions as to when to chdir there during its
execution and leads to better sandboxing because the pwd doesn't leak to
init() functions anymore.
Test: Manual.
Change-Id: I1560da8ed3a621249426f9e8908aa890c21e13ba
Also delete the now-unnecessary soong_env binary.
Test: Manually. Also checked what happens when a used environment
variable changes.
Change-Id: Ib393e7f444e94819198c6cce4bcd8719d9fd9441
