Usage of the -ffixed-line-length-n Option

Currently, n in the -ffixed-line-length-n option can only be set to 72 or 132 in BiSheng compiler earlier than 4.0.0. If n is set to other values, the compilation fails. Therefore, if n in the compiler option is not 72 or 132, change it to 72 or 132. In BiSheng compiler 4.0.0 and later versions, n can be set to other values.