/usr/src/games/atc build warning/failure

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

with WARNS_WERROR:

cc  -O -g -pipe -march=prescott -I/usr/src/games/atc -I. 
-Wsystem-headers -Werror -Wall -W -Wno-unused-parameter 
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type 
-Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wcast-align 
-Wunused-parameter -Wchar-subscripts -Winline -Wnested-externs 
-Wredundant-decls -c /usr/src/games/atc/list.c
cc1: warnings being treated as errors
/usr/src/games/atc/list.c: In function 'newplane':
/usr/src/games/atc/list.c:56: warning: implicit declaration of function 
'calloc'
/usr/src/games/atc/list.c:56: warning: incompatible implicit declaration 
of built-in function 'calloc'
*** Error code 1
1 error

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