IBCLR (integer, position)

  Class:  Elemental function - Generic

  Returns the value of the first argument with the specified bit set
  to 0 (bit clear).  The low-order bit is position 0.

  +------+---------+----------+------------+-------------+
  | Args | Generic | Specific |  Argument  | Result Type |
  +------+---------+----------+------------+-------------+
  |  2   |  IBCLR  |   --     | INTEGER*1  | INTEGER*1   |
  |      |         | IIBCLR   | INTEGER*2  | INTEGER*4   |
  |      |         | JIBCLR   | INTEGER*4  | INTEGER*4   |
  |      |         | KIBCLR   | INTEGER*8  | INTEGER*8   |
  +------+---------+----------+------------+-------------+