util: refactor to use DETECT_OS_ANDROID

except leaving u_endian.h behind to use __ANDROID__ directly to be
consistent with the rest in that file, which deserves a different
refactor

Signed-off-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Yonggang Luo <luoyonggang@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27374>

src/util/tests/cache_test.cpp

@@ -37,6 +37,7 @@
 #include <time.h>
 #include <unistd.h>
 
+#include "util/detect_os.h"
 #include "util/mesa-sha1.h"
 #include "util/disk_cache.h"
 #include "util/disk_cache_os.h"
@@ -190,7 +191,7 @@ test_disk_cache_create(void *mem_ctx, const char *cache_dir_name,
 
    disk_cache_destroy(cache);
 
-#ifdef ANDROID
+#if DETECT_OS_ANDROID
    /* Android doesn't try writing to disk (just calls the cache callbacks), so
     * the directory tests below don't apply.
     */