wrong label in disassembled CLEO script

[x87]

Under certain conditions the disassembler can replace main.scm offset with a local label.

1. the offset should be positive (i.e. reference some instruction in MAIN)
2. the script should have an instruction at the exact same offset.

after disassembling and comping, the offset changes from X to -X.

synthetic repro

{$CLEO}
nop
gosub 2

after recompiling it becomes gosub -2

This bug only affects standalone CLEO scripts/missions and not main.scm.

[x87]

fixed in 4.2.0