Use math.floor() on calculation results in lua build scripts
Use math.floor() on calculation results in lua build scripts

Without this function, new versions of tup (with new version of lua) use
floating point numbers like "131072.0" instead of expected integers like
"131072". Such values are not valid arguments for the linker script
generator and cause an error.
CezaryGapinski/distortos,CezaryGapinski/distortos,jasmin-j/distortos,jasmin-j/distortos,DISTORTEC/distortos,DISTORTEC/distortos,jasmin-j/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos,jasmin-j/distortos,CezaryGapinski/distortos,jasmin-j/distortos,DISTORTEC/distortos,DISTORTEC/distortos