odb_loose: largefile tests only on 64 bit platforms

Only run the large file tests on 64 bit platforms.

Even though we support streaming reads on objects, and do not need to
fit them in memory, we use `size_t` in various places to reflect the
size of an object.

tests/odb/largefiles.c

@@ -67,6 +67,10 @@ void test_odb_largefiles__streamwrite(void)
 {
 	git_oid expected, oid;
 
+#ifndef GIT_ARCH_64
+	cl_skip();
+#endif
+
 	if (!cl_is_env_set("GITTEST_INVASIVE_FS_SIZE") ||
 		!cl_is_env_set("GITTEST_SLOW"))
 		cl_skip();
@@ -88,6 +92,10 @@ void test_odb_largefiles__streamread(void)
 	git_otype type;
 	int hdr_len, ret;
 
+#ifndef GIT_ARCH_64
+	cl_skip();
+#endif
+
 	if (!cl_is_env_set("GITTEST_INVASIVE_FS_SIZE") ||
 		!cl_is_env_set("GITTEST_SLOW"))
 		cl_skip();
@@ -165,7 +173,12 @@ void test_odb_largefiles__read_header(void)
 	size_t len;
 	git_otype type;
 
-	if (!cl_is_env_set("GITTEST_INVASIVE_FS_SIZE"))
+#ifndef GIT_ARCH_64
+	cl_skip();
+#endif
+
+	if (!cl_is_env_set("GITTEST_INVASIVE_FS_SIZE") ||
+		!cl_is_env_set("GITTEST_SLOW"))
 		cl_skip();
 
 	writefile(&oid);