system/libcap: tests may leave dirty environment
Found on ppc64:
1000 309565 0.0 0.0 4672 1280 pts/0 S Jun23 0:00 ./libcap_psx_test
1000 309566 0.0 0.0 4672 1280 pts/0 S Jun23 0:00 ./libcap_psx_test
Found on ppc64:
1000 309565 0.0 0.0 4672 1280 pts/0 S Jun23 0:00 ./libcap_psx_test
1000 309566 0.0 0.0 4672 1280 pts/0 S Jun23 0:00 ./libcap_psx_test