test/silly: Extend include path.
When attempting to build uClibc under buildroot, including building the
tests, the silly tests don't currently compile, a result of attempting
to build using a compiler that does not yet have an installed version of
uClibc available. The error is a missing header file, specifically
atomic.h.
Taking inspiration from the nptl tests, I have extended the EXTRA_CFLAGS
variable to add the required include paths. The tests can now be built
under buildroot.
Signed-off-by: Andrew Burgess <andrew.burgess@embecosm.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>