modify pidtest according David Lee's suggestion
make pidtest.c return non-zero on failure, 0 on success
move pidtest.c from tools/ to config/
use AC_TRY_RUN to test run the program

CVS patchset: 7870
CVS date: 2005/10/17 22:29:00

Mercurial revision: 97911c8c22646d2c1d5a65d6f25ec3b72c365d1d