Add second arg to main() in 1998/schweikh3

1998/schweikh3/schweikh3.alt.c

@@ -77,7 +77,7 @@ i-3; w             =e+s+1; l=q+N*   (j-1)-      j*(j-1   )/ 2 ;            do{ *
  2; } } M5(q);     } Z M2 P(t*p     ){ H p){ P(p _ R);   H  p _            c>1){ M1 i=0
          ; f*l=    p _ l;           for (;      i< p _   c; ++i            ){ A[i
          ]= l _    n; l=l           _ x; }      C (p _   s, p _    c); }   P (p _ 
-         L) ; }    }  int           main V      { t*r=   0; I F    ; for   (; ; )
+         L) ; }    }  int           main (M7,M6)I*M6;      { t*r=   0; I F    ; for   (; ; )
 { H!(F U 1024))    )X H !           fgets(      F,1024   ,stdin) )break;   *(F+(y
 =strlen(F))-1)=    0; H!(          F=M3(F,      y)))X H   stat(F,&S)==0    &&S_ISREG(S.
  st_mode)&&S O     )r=J(r          ,F ); }      H r)P(r    ); u 0; }/*     Obfuscated C

1998/schweikh3/schweikh3.c

@@ -53,7 +53,7 @@ i-3; w             =e+s+1; l=q+N*   (j-1)-      j*(j-1   )/ 2 ;            do{ *
  2; } } M5(q);     } Z M2 P(t*p     ){ H p){ P(p _ R);   H  p _            c>1){ M1 i=0
          ; f*l=    p _ l;           for (;      i< p _   c; ++i            ){ A[i
          ]= l _    n; l=l           _ x; }      C (p _   s, p _    c); }   P (p _ 
-         L) ; }    }  int           main V      { t*r=   0; I F    ; for   (; ; )
+         L) ; }    }  int           main (M7,M6)I*M6;   { t*r=   0; I F    ; for   (; ; )
 { H!(F U 1024))    )X H !           fgets(      F,1024   ,stdin) )break;   *(F+(y
 =strlen(F))-1)=    0; H!(          F=M3(F,      y)))X H   stat(F,&S)==0    &&S_ISREG(S.
  st_mode)&&S O     )r=J(r          ,F ); }      H r)P(r    ); u 0; }/*     Obfuscated C

thanks-for-fixes.md

@@ -2183,6 +2183,11 @@ Cody added the [alternate code](1998/schweikh3/README.md#alternate-code) which a
 to reconfigure the size constant in the rare case that the author wrote about
 occurs.
 
+Cody made `main()` have two args out of an abundance of caution as some versions
+of clang say that `main()` can only have 0, 2 or 3 args. These versions accept 1
+arg but it is entirely possible that they fix this so this should prevent it
+from breaking if that happens.
+
 Cody added the [try.sh](1998/schweikh3/try.sh) script to make it easier to try
 the commands that we suggested. One command was not added, that of the to use
 command.