refactor V_DrawLine

(a & ~b) | b = (a | b) & (!b | b) = (a | b) & T = a | b

_fmemchr isn't used anymore

Doom8088 title screen

byte array -> bit array

mobj_t.tracer is always NULL

R_PointOnSide returns an int16_t instead of int8_t

some FixedMul functions in assembly, thanks @sqpat and zero318

check bmalpool size

k is never j

replace div by xor, thanks @sqpat

Z_Strdup always gets a valid string

Watcom does have endian.h

don't change string literals

change tag of finished patch to cache, instead of finished string