Fixed some tests that failes when built with valgrind

Example build: ./BUILD/compile-pentium64-valgrind-max

Fixes:
- sp-no-valgrind failed if binary was built for valgrind as in this case
  mem_root is allocated in very small hunks which the test cannot handle.
  Fixed by testing of valgrind build
- truncate_notembedded failed in reap because of more memory used.
  Fixed by allowing reap to fail too

mysql-test/include/not_valgrind_build.inc

+if (`select version() like '%valgrind%'`)
+{
+  skip Does not run with binaries built with valgrind;
+}

mysql-test/main/sp-no-valgrind.test

 
---source include/not_valgrind.inc
+--source include/not_valgrind_build.inc
 
 --echo # MDEV-20699 do not cache SP in SHOW CREATE
 --echo # Warmup round, this might allocate some memory for session variable

mysql-test/main/truncate_notembedded.test

@@ -18,6 +18,7 @@ SELECT * FROM t1;
 UNLOCK TABLES;
 
 --connection con1
+--error 0,ER_OPTION_PREVENTS_STATEMENT
 --reap
 # This may work or fail as different servers uses different amount of
 # memory and the statement may work or not. What is important is that we