[Coco] CMOC compilation problems

[Alex Evans]

When the build comes to trying to create atol.ecb_o it reacts as if
there is a malformed option passed to cmoc:

../cmoc -c -O2 -DNDEBUG -nostdinc -I . -o atol.ecb_o atol.c
: illegal option -- x
: illegal option -- c
: illegal option -- n
: illegal option -- o
: illegal option -- s
: illegal option -- t
: illegal option -- d
: illegal option -- i
: illegal option -- n
: illegal option -- c
: illegal option -- u
: illegal option -- n
: illegal option -- d
: illegal option -- e
: illegal option -- f
:1: error: syntax error: #

This is on Arch Linux where my default compiler is gcc 9.2.0