Add alt code to 1986/hague - fgets()

The reason it is in alt code is because one of the forms of input (see
below) will, although print out correct output, segfault after
outputting the text. That is when one does something like:

    echo foo | ./hague.alt

Whether it might be worth making it the entry itself with a note in the
Makefile and README.md and bugs.md (because it does print out correct
output) can be determined later - or not.

This change required several files to be updated besides the new file
hague.alt.c.

1986/hague/Makefile

@@ -114,8 +114,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
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