gotsigchild and onsigchild are unused

[Denys Vlasenko <vda.linux@xxxxxxxxxxxxxx>]

This function and variable are not used anywhere:

#ifdef SYSV
STATIC int onsigchild(void);
#endif
...
...
#ifdef SYSV
STATIC int gotsigchild;

STATIC int onsigchild() {
        gotsigchild = 1;
}
#endif


Note that there is a very similarly named "gotsigchld"
(without "i" in "chld") variable.
That one *is not* unused.
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