Tests: Fix compilation error when threading support has been disabled.

Now tests that require threading are skipped when threading
support has been disabled.

Thanks to Sebastian Andrzej Siewior.

tests/test_check.c

@@ -235,6 +235,9 @@ test_lzma_get_check_st(void)
 static void
 test_lzma_get_check_mt(void)
 {
+#ifndef MYTHREAD_ENABLED
+	assert_skip("Threading support disabed");
+#else
 	const uint32_t flags = LZMA_TELL_ANY_CHECK |
 			LZMA_TELL_UNSUPPORTED_CHECK |
 			LZMA_TELL_NO_CHECK;
@@ -311,6 +314,7 @@ test_lzma_get_check_mt(void)
 #endif
 
 	lzma_end(&strm);
+#endif
 }
 
 

tests/test_hardware.c

@@ -30,8 +30,12 @@ test_lzma_physmem(void)
 static void
 test_lzma_cputhreads(void)
 {
+#ifndef MYTHREAD_ENABLED
+	assert_skip("Threading support disabed");
+#else
 	if (lzma_cputhreads() == 0)
 		assert_skip("Could not determine cpu core count");
+#endif
 }
 
 

tests/test_memlimit.c

@@ -53,6 +53,9 @@ test_memlimit_stream_decoder(void)
 static void
 test_memlimit_stream_decoder_mt(void)
 {
+#ifndef MYTHREAD_ENABLED
+	assert_skip("Threading support disabed");
+#else
 	lzma_stream strm = LZMA_STREAM_INIT;
 	lzma_mt mt = {
 		.flags = 0,
@@ -79,6 +82,7 @@ test_memlimit_stream_decoder_mt(void)
 
 	assert_lzma_ret(lzma_code(&strm, LZMA_FINISH), LZMA_STREAM_END);
 	lzma_end(&strm);
+#endif
 }