fstatat64.test: lift /proc requirement
fstatat64.test: lift /proc requirement

While -P option needs /proc to match descriptors, it does not use
/proc to match pathnames.  As this test does not need descriptor
match, the /proc requirement can be safely lifted.

* tests/fstatat64.test: Lift /proc/self/fd/ requirement.

kapdop/android_external_strace,Distrotech/strace,vrastogi/strace,Distrotech/strace,Distrotech/strace,vrastogi/strace,kapdop/android_external_strace,vrastogi/strace,Distrotech/strace,cuviper/strace,kapdop/android_external_strace,vrastogi/strace,vrastogi/strace,Saruta/strace,Saruta/strace,Saruta/strace,cuviper/strace,Saruta/strace,cuviper/strace,Saruta/strace,kapdop/android_external_strace,cuviper/strace,Distrotech/strace,cuviper/strace,kapdop/android_external_strace