Delete alt code of 1992/adrian

It is just the original code and there's no good reason for it to be
compiled.

1992/adrian/.gitignore

@@ -1,26 +1,14 @@
-ad.alt.temp
 adbasename
-adbasename.alt
-adbasename.alt.c
 adbasename.c
 adecho
-adecho.alt
-adecho.alt.c
 adecho.c
 adgrep
 adhead
-adhead.alt
-adhead.alt.c
 adhead.c
 adrian
-adrian.alt
 adsleep
-adsleep.alt
-adsleep.alt.c
 adsleep.c
 adwc
-adwc.alt
-adwc.alt.c
 adwc.c
 adrian.orig
 prog.orig