K 10
svn:author
V 6
adridg
K 8
svn:date
V 27
2021-01-27T19:52:31.259286Z
K 7
svn:log
V 414
Fix build of games/xinvaders on 13 and 14

There are symbols declared in vaders.h with `ext` as storage class qualifier.
Those are either `extern` or (blank) depending on `MAIN` being defined.
Some of them duplicate symbols that are defined in spacers.c, though.
Those ought to be `extern` in all cases, rather than also defined in
main.c (because the storage class qualifier is blank then).

Reported by:	antoine

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