fix arm compilation error

tests/examples/c/schemaless.c

 #include "taos.h"
 #include "taoserror.h"
+#include "os.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -80,7 +81,7 @@ int main(int argc, char* argv[]) {
   int64_t  begin = getTimeInUs();
   int32_t code = taos_insert_lines(taos, lines, numSuperTables * numChildTables * numRowsPerChildTable);
   int64_t end = getTimeInUs();
-  printf("code: %d, %s, %ld\n", code, tstrerror(code), end-begin);
+  printf("code: %d, %s. time used: %"PRId64"\n", code, tstrerror(code), end-begin);
 
   char* lines_000_0[] = {
       "sta1,id=sta1_1,t0=true,t1=127i8,t2=32767i16,t3=2147483647i32,t4=9223372036854775807i64,t5=255u8,t6=32770u16,t7=2147483699u32,t8=9223372036854775899u64,t9=11.12345f32,t10=22.123456789f64,t11=\"binaryTagValue\",t12=L\"ncharTagValue\" c0=true,c1=127i8,c2=32767i16,c3=2147483647i32,c4=9223372036854775807i64,c5=255u8,c6=32770u16,c7=2147483699u32,c8=9223372036854775899u64,c9=11.12345f32,c10=22.123456789f64,c11=\"binaryValue\",c12=L\"ncharValue\" 1626006833639000us"