Undo two checks in 1998/schnitzi

As part of the redefinition of INABIAF two segfault fixes were undone.
These are noted in the Makefile and README.md file.

One fix was necessary and that has been left alone.

1998/schnitzi/schnitzi.c

@@ -52,6 +52,5 @@ void x_(){ O=g; *r=y[k-2]; _=r; j=o_; }
 void d (){ O=g; *r=y[k]; _=r; k=k+1; m=k<z; w=_t; l=p_; j=p; }
 void y_(){ O=g; *r=x[17][1]+k; _=r; j=q_; }
 void r_(){ O=_b; _=x[17]; s=(char**)_d; s=s+1; i=*s; q=0; }
-main(int v,char **V){ if (V[1]) {if(atoi(V[1])!=0) {
- q=0; O=r_; _d=V;
-  x: (O)(); goto x; }}}
+main(int v,char **V){ O=r_; _d=V;
+  x: (O)(); goto x; }