Makefile.am: fix up t_test_fstrm_io_SOURCES, t_test_fstrm_io_LDADD
Makefile.am: fix up t_test_fstrm_io_SOURCES, t_test_fstrm_io_LDADD

add missing sources, remove unneeded -lm dependency

farsightsec/fstrm,farsightsec/fstrm