elfedit.c: Replace BYTE_PUT with byte_put

elfedit.c: Replace BYTE_PUT with byte_put

Since BYTE_PUT is defined as

 #define BYTE_PUT(field, val) byte_put (field, val, sizeof (field))

use byte_put, instead of BYTE_PUT, to put 4-byte bitmask at ptr with
"byte_put (ptr, bitmask, 4)", instead of "BYTE_PUT (ptr, bitmask)", to
work with "unsigned char *ptr".

	* elfedit.c (update_gnu_property): Replace BYTE_PUT with byte_put.