Disable test that needs alsa at build-time

FAIL: ./tests/libcw_test_tq_short_space.sh
==========================================

/home/myon/afu/unixcw/unixcw/src/libcw/tests/.libs/libcw_test_tq_short_space: 1 cycle(s)
ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave
FAIL tests/libcw_test_tq_short_space.sh (exit status: 1)

--- a/src/libcw/Makefile.am
+++ b/src/libcw/Makefile.am
@@ -135,7 +135,7 @@ CLEANFILES = libcw_test_internal.sh libc
 TESTS = $(check_SCRIPTS)
 
 # run test programs
-check_SCRIPTS = libcw_test_internal.sh ./tests/libcw_test_tq_short_space.sh
+check_SCRIPTS = libcw_test_internal.sh #./tests/libcw_test_tq_short_space.sh
 libcw_test_internal.sh:
 	echo './libcw_test_internal | grep "test result: success"' > libcw_test_internal.sh
 	chmod +x libcw_test_internal.sh
