[Patch, Fortran, OOP] PR 49638: [OOP] length parameter is ignored when overriding type bound character functions with constant length.

[Thomas Koenig]

If we really wanted to do this The Right Way, there would be seven
cases to be considered, best expressed as three flags.  I'll call them
CAN_BE_LESS, CAN_BE_EQUAL and CAN_BE_MORE.

Comparing a vs. a+1 would yield CAN_BE_LESS for integers and
CAN_BE_LESS | CAN_BE_EQUAL for floats.

Comparing 3 vs. 4 would yield CAN_BE_LESS.

Comparing a vs. 5 would yield CAN_BE_LESS | CAN_BE_EQUAL | CAN_BE_MORE.

Comparing NaN against anything would yield 0.

And so on...

	Thomas