remove a couple hundred sys/param.h includes in userland code, and
also whack some sys/cdefs.h early includes which is such a brutally
bad pattern
ok bluhm mbuhl

Fix mmap() calls that check for a result other than MAP_FAILED.

ok tedu@

Add check that mkstemp() fails with EINVAL if the string has fewer than
6 Xs

Test mkstemps() too

Add a regression suite for mkstemp(), verifying that it neither overruns
no underruns the supplied template buffer, that it can generate names that
don't contain any X's, and that all open() calls th

Add a regression suite for mkstemp(), verifying that it neither overruns
no underruns the supplied template buffer, that it can generate names that
don't contain any X's, and that all open() calls that pass O_CREAT also
pass O_EXCL

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