Expand float size to avoid assert()ion failures.

"_db_func_" isn't a known linked object on some platforms, possibly 
because it is occasionaly shadowed by DBUG variables.  Avoid that
confusion.


sql/sql_profile.cc:
  Expand float size to avoid assert()ion failures.
  
  "_db_func_" isn't a known linked object on some platforms, possibly 
  because it is occasionaly shadowed by DBUG variables.  Avoid that
  confusion.
sql/sql_profile.h:
  "_db_func_" isn't a known linked object on some platforms, possibly 
  because it is occasionaly shadowed by DBUG variables.  Avoid that
  confusion.