Fix 1998/schnitzi for linux

It segfaulted due to wrong type of a variable.

It still crashes under macOS which I will be looking at in the near
future but it at least works for linux.

I noted in the bugs.md a compiler warning that should not be changed as
it's not a bug and in fact 'fixing' it will introduce a bug.

1998/schnitzi/schnitzi.c

@@ -1,8 +1,8 @@
 typedef void e();
 
-e *w,*l,*u,*_o,*j,*t,*O,exit,b,c_,b_,a_,c,a,z_,x_,d,y_,_m;
-int q,m,_d,z,k,h,f[99];
-char y[26],_p[40][26],_q,r[2],*_,**s,*i,
+e *w,*l,*u,*_o,*j,*t,*O,b,c_,b_,a_,c,a,z_,x_,d,y_,_m;
+int q,m,z,k,h,f[99];
+char y[26],_p[40][26],_q,r[2],*_,**s,*i,*_d,
 
 *x[]= { "\n", ")", "if (", "}\n", ");\n\n", "    ", ",&", "\"",
   ",", " %%d", ";\n\n    scanf(\"%%d", "%%d ", "else ", ",", "<",