ld.so: Adjust the auxv if ld.so is directly invoked.

ld.so: Adjust the auxv if ld.so is directly invoked.

If a binary gets invoked by passing it as argument to ld.so the stack
still holds the auxiliary vector of ld.so when entering the _start
routine of the executable.  So the invocation via ld.so is not fully
transparent to the executable.  This causes problems if the executable
wants to scan the auxv itself.