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.

1986/applin/.gitignore

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

1986/august/.gitignore

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

1986/bright/.gitignore

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

1986/hague/.gitignore

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

1986/holloway/.gitignore

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

1986/marshall/.gitignore

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

1986/pawka/.gitignore

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

1986/stein/.gitignore

@@ -1,2 +1,4 @@
 a.out
 stein
+stein.orig
+prog.orig

1986/wall/.gitignore

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