randombytes_internal_random.c: move clang target attribute down

Specifically, move it after the system includes.

This appears to address an issue with clang 18 when cross-compiling
to windows.

Fixes #1413

src/libsodium/randombytes/internal/randombytes_internal_random.c

@@ -44,14 +44,6 @@
 #ifdef BLOCK_ON_DEV_RANDOM
 # include <poll.h>
 #endif
-#ifdef HAVE_RDRAND
-# ifdef __clang__
-#  pragma clang attribute push(__attribute__((target("rdrnd"))), apply_to = function)
-# elif defined(__GNUC__)
-#  pragma GCC target("rdrnd")
-# endif
-# include <immintrin.h>
-#endif
 
 #include "core.h"
 #include "crypto_core_hchacha20.h"
@@ -109,6 +101,15 @@ BOOLEAN NTAPI RtlGenRandom(PVOID RandomBuffer, ULONG RandomBufferLength);
 # endif
 #endif
 
+#ifdef HAVE_RDRAND
+# ifdef __clang__
+#  pragma clang attribute push(__attribute__((target("rdrnd"))), apply_to = function)
+# elif defined(__GNUC__)
+#  pragma GCC target("rdrnd")
+# endif
+# include <immintrin.h>
+#endif
+
 typedef struct InternalRandomGlobal_ {
     int           initialized;
     int           random_data_source_fd;