#4062 z80MightRead doesn't know `nextreg` and issues a warning

[Łukasz Wołowiec]

version 4.6.0 (z88dk fork)

Warning: z80MightRead unknown asm inst line: nextreg    #110,a

The details and proposed fix are described here: https://github.com/z88dk/z88dk/issues/3077

[Philipp Klaus Krause]

Should be fixed in [r16827]/[r16828]. Please check if it works for you.