[rfc][icedtea-web] Fix run-cpp-unit-tests on F18

[Adam Domurad]

Hi. It doesn't seem like the gcc flags used bring in the needed 
dependencies on F18 anymore.
NB:  Duplicate flags are harmless, so it shouldn't break any other systems.

ChangeLog:
2013-XX-XX  Adam Domurad  <adomurad at redhat.com

     * Makefile.am
     (CPP_UNITTEST_EXECUTABLE): Add -lrt & -lpthread flags, which do not
     seem to be brought in on all systems.

OK to push?
-Adam
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