Mass .gitignore update for .orig.c files

Due to the fact we now have .orig.c files and thus the possibility of
winner.orig or prog.orig being built I have updated all the .gitignore
files so that these files ignored. This was done with the following
shell commands, for reference:

    for i in $(find 19* 200* 201[0123] -mindepth 2 -maxdepth 2 -name .gitignore) ; do echo $(dirname "$i"|sed -e 's,[0-9]\{4\}/,,g').orig >> "$i"; done
    for i in $(find 201[4-9] 2020 -mindepth 2 -maxdepth 2 -name .gitignore) ; do echo prog.orig >> "$i"; done

and the two commands is because it was only in 2014 that the winning
entries were renamed to prog so prog.orig is the correct glob.

1987/biggar/.gitignore

@@ -1 +1,3 @@
 biggar
+biggar.orig
+prog.orig

1987/heckbert/.gitignore

@@ -5,3 +5,5 @@ foo.c
 heckbert
 ph
 ph.c
+heckbert.orig
+prog.orig

1987/hines/.gitignore

@@ -1,2 +1,4 @@
 hines
 hines.alt
+hines.orig
+prog.orig

1987/korn/.gitignore

@@ -1 +1,3 @@
 korn
+korn.orig
+prog.orig

1987/lievaart/.gitignore

@@ -2,3 +2,5 @@ lievaart
 lievaart.alt
 lievaart2
 lievaart2.alt
+lievaart.orig
+prog.orig

1987/wall/.gitignore

@@ -1,2 +1,4 @@
 wall
 wall.alt
+wall.orig
+prog.orig

1987/westley/.gitignore

@@ -1 +1,3 @@
 westley
+westley.orig
+prog.orig