Move the stdatomic import

Author: Kerollmops

libraries/liblmdb/mdb.c

@@ -32,7 +32,6 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
-#include <stdatomic.h>
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE 1
 #endif
@@ -138,6 +137,7 @@ static NtCloseFunc *NtClose;
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
+#include <stdatomic.h>
 
 #ifdef _MSC_VER
 #include <io.h>