Trivial tests for <alloca.h> and <byteswap.h>, plus slightly improved
test coverage for <inttypes.h> and <stdlib.h>.
Bug: N/A
Test: ran tests
Change-Id: Idac4141ffc760c4f7756332477ce5112950d61a5
Signed-off-by: Aleksandra Tsvetkova <aleksandra.tsvetkova@intel.com>
