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

@@ -0,0 +1,4 @@
+if (`select version() like '%valgrind%'`)
+{
+  skip Does not run with binaries built with valgrind;
+}