Only assert about x86_64 struct sizes if ABI is LP64, not x32

The __x86_64__ macro identifies a CPU family, and is unfortunately not
enough to identify a concrete ABI.

The normal x86_64 ABI that is used by practical Linux distributions is
LP64 (i.e. 32-bit int, and 64-bit long and pointer), and defines
__x86_64__ and __LP64__.

x32 is a niche ILP32 ABI (i.e. 32-bit int, long and pointer) for x86_64
CPUs, which has different struct sizes due to sizeof(long) and
sizeof(void *) being smaller. It defines __x86_64__ and __ILP32__.

Signed-off-by: Simon McVittie <smcv@debian.org>

src/tests/test-array.c

@@ -27,7 +27,7 @@
 static void test_abi(void)
 {
 	/* array */
-#if defined(__x86_64__)
+#if defined(__x86_64__) && defined(__LP64__)
 	spa_assert(sizeof(struct pw_array) == 32);
 #else
 	fprintf(stderr, "%zd\n", sizeof(struct pw_array));

src/tests/test-properties.c

@@ -26,7 +26,7 @@
 
 static void test_abi(void)
 {
-#if defined(__x86_64__)
+#if defined(__x86_64__) && defined(__LP64__)
 	spa_assert(sizeof(struct pw_properties) == 24);
 #else
 	fprintf(stderr, "%zd\n", sizeof(struct pw_properties));

src/tests/test-stream.c

@@ -59,7 +59,7 @@ static void test_abi(void)
 	TEST_FUNC(ev, test, process);
 	TEST_FUNC(ev, test, drained);
 
-#if defined(__x86_64__)
+#if defined(__x86_64__) && defined(__LP64__)
 	spa_assert(sizeof(struct pw_buffer) == 24);
 	spa_assert(sizeof(struct pw_time) == 40);
 #else