LRES (ul_pccns)

	LRES(word.i2.r, bit_number.i2.r)

	This routine clears a bit in a byte string.  'bit_number' must
	be an integer bit number ranging from 0 to 15 with each bit
	being numbered in ascending order from right to left in agreement
	with DEC's bit numbering convention.

	word		word to modify
	bit_number	bit number to clear (starts at 0)

	This function requires the following include files:

	ul_pccns_h:clibpc_h

	Related functions:

	LSET, RSTBIT, SETBIT

	C usage:

	short	word = 0xFFFF;
	short	bit_number = 0;

	LRES(&word,&bit_number);