- Update of test toolsand Makefiles to make it possible to test always test udf's as part 
of the mysql test suite


mysql-test/mysql-test-run.pl:
  Add the path where mysqld will udf_example.so used by the udf test
mysql-test/r/udf.result:
  Update test results
mysql-test/t/udf.test:
  Update tests
  The "--error 0" directives should actually be changed to the correct error number returned but that error  number is lost. W e do however get the right error message and that is checked in 
  the .result file.
sql/Makefile.am:
  Build shared library udf_example.so
sql/share/errmsg.txt:
  Update the max length of %s string from 64 to 128
sql/sql_udf.cc:
  Add DBUG_PRINT just before dl_open
sql/udf_example.cc:
  Use isalpha instade of my_isalpha