patch for printf memory use tests

[Bruce Korb]

As was ultimately figured out, unused libraries consume address
space and are not dumped into the core image.  "gdb info target"
doesn't yield very friendly information about the issue, either.
You have to suspend GDB and go have a peek at /proc/$PID/maps
and do some hex arithmetic.  This patch does a few things:

1. It increases the number of iterations of the test-fprintf-posix3
   and test-dprintf-posix2 to 1,500 so that 15MB of address space
   is allowed.  This is big enough for the additional libposix space
   needs on a Linux x86-64 box.

2. It adds another test when the test program's argument is "0".
   Mainly, it has to work for one iteration of the test.  If it
   does not, then this command is run:

      echo "Testing error: designated memory size is too small"

3. The tests take micro seconds longer, due to the extra iterations.

0001-tests-large-libraries-may-foil-setrlimit-printf-test.patch
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