include stdlib.h and stop redeclaring malloc, free in alloc.c - #81
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This change is necessary for -Wall -Werror, to prevent the following:
./compile alloc.c
alloc.c:3:14: error: conflicting types for built-in function ‘malloc’ [-Werror]
extern char *malloc();
^~~~~~
Which cannot be turned off without also turning off -Werror.