output meson valgrind unit test log

When the unit tests are run with valgrind, the failure details were not
being written to stdout

Tested:
Ensured testlog-valgrind.txt is now written to stdout

Change-Id: I74873ec0bb2cad1b6962048d83765c56319b6e2f
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
1 file changed