Remove 1986/wall alt code

The alt code was just a patched (by Yusuke Endoh) version (two strings
were strdup()d) that still required -traditional-cpp. He is still
credited in the thanks file but one can do make diff_orig_prog to see
what was changed to make it not require -traditional-cpp and Yusuke's
fix is there too. The thanks file details what I had to do to make it
work without -traditional-cpp and his change is still there as well. It
seemed to serve no purpose to have an alt version that requires one to
use -traditional-cpp when one can just look at the original code if they
want to see what it was like back in 1986.

1986/wall/wall.alt.c

@@ -1,78 +0,0 @@
-#define _c(C)_ (C)&('|'+3):c_()(C)>>('\n'-3) __; /**/
-#define C char*
-#define keyboard ",,B3-u;.(&*5., /(b*(1\036!a%\031m,,,,,\r\n"
-#define main(o,oo)oo(o){
-#define _ ;case
-C
-#define c_(cc)c cc=
-#define C_(sand)_O(sand)witch
-o=keyboard;
-#define __ ;break;
-C
-ccc(
-cc)
-C
-cc;
-{ cc=strdup(cc);
-C
-cccc=
-cc;int
-#ifndef lint
-#define keyboard "dijs QH.soav Vdtnsaoh DmfpaksoQz;kkt oa, -dijs"
-#endif
-c;
-main(;c_(=(*cc);*cc++)c,for);
-#define _O(s)s
-main(0xb+(c>>5),C_(s))
-_'\v'
-:__ _'\f':
-main(c,C_(s));
-_c(8098)_c(6055)_c(14779)_c(10682)
-#define O_(O)_O(O)stem(ccc(
-_c(15276)_c(11196)_c(15150)
-#define _C ;return
-_c(11070)_c(15663)_c(11583)
-}
-__
-default
-:c_(+)o[c&__LINE__-007];
-main(c_(-)'-'-1,C_(s))_
-0214
-:_
-0216
-:c_(+)025 _
-0207
-:c_(-)4 _
-0233
-:c_(+)' '-1;
-}}c_(&)'z'+5;
-}_C cccc;
-}main(,cc)
-C
-#define O write(1,
-c=strdup("O");
-O_(sy) keyboard));
-main(;;,for);
-read(0,
-c,1);*
-c_(&)'~'+1
-;O ccc(
-c),
-'\0');
-main(*c,
-C_(s));_
-4
-:O_(sy)";kkt -oa, dijszdijs QQ"))_C
-_
-13
-:O o+' ',
-3
-)
-#undef main
-__ _ 127:O"\b \b",3)__
-default
-:O
-c,1)
-__}}}main(){
-cc();
-}