Update cpuid_loongarch64.c

cpuid_loongarch64.c

@@ -32,6 +32,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 **********************************************************************************/
 #include <stdio.h>
 #include <stdint.h>
+#include <string.h>
 #include <sys/auxv.h>
 
 /*  If LASX extension instructions supported,