- Add variable "have_dynamic_loading" and use it to check if the udf test should be run.


mysql-test/include/have_udf.inc:
  Use variable "have_dynamic_loading" to to determine if there is support for udf's
mysql-test/r/have_udf.require:
  Use variable "have_dynamic_loading" to to determine if there is support for udf's
mysql-test/t/disabled.def:
  Remove udf from disabled
sql/mysql_priv.h:
  Add have_dlopen variable
sql/mysqld.cc:
  Add have_dlopen variable
sql/set_var.cc:
  Add have_dlopen variable and name it "have_dynamic_loading" in "SHOW VARIABLES"