patch applied (packages/unix): add tests from GHC testsuite

[Simon Marlow]

Mon Mar  5 06:52:58 PST 2007  Simon Marlow <simonmar at microsoft.com>
  * add tests from GHC testsuite

    A ./tests/
    A ./tests/Makefile
    A ./tests/all.T
    A ./tests/fileexist01.hs
    A ./tests/fileexist01.stdout
    A ./tests/forkprocess01.hs
    A ./tests/forkprocess01.stdout
    A ./tests/getEnvironment01.hs
    A ./tests/getEnvironment01.stdout
    A ./tests/queryfdoption01.hs
    A ./tests/queryfdoption01.stdout
    A ./tests/signals001.hs
    A ./tests/signals001.stdout
    A ./tests/signals001.stdout-i386-unknown-freebsd
    A ./tests/signals001.stdout-i386-unknown-openbsd
    A ./tests/signals001.stdout-sparc-unknown-openbsd
    A ./tests/signals001.stdout-x86_64-unknown-openbsd
    A ./tests/signals002.hs
    A ./tests/signals002.stdout