"Dynamic plugins fail to load on FreeBSD"
  ELF executables need to be linked using the -export-dynamic option to
  ld(1) for symbols defined in the executable to become visible to dlsym().
  Also, do not build plugins on an all-static build.


configure.in:
  Bug#30296
    Use "-export-dynamic" when building executable for use with plugins.
    Add required option using MYSQLD_EXTRA_LDFLAGS variable so we do not
    affect any other binary.
config/ac-macros/plugins.m4:
  Do not build plugins when building all-static
sql/sql_yacc.yy:
  build fix - surplus semicolon