refactor for automatic .dat files

Now `make` makes .dat files on the fly, so they're never out of sync
with the base-file.

Also, /usr/local has been abandoned as it does not work with fortune.

Makefile

@@ -1,42 +1,24 @@
 ########## Variables ##########
 
-fortune_directory = /usr/local/share/fortune
+fortune_directory = /usr/share/fortune
 
-# This just equals 'ttrpg.dat', but if someone wants to split it into separate
-# files, e.g. 'D20.dat' and 'WW.dat', the they would be included.
+cookies = $(wildcard ttrpg*)
 
-dat_files = $(wildcard *.dat)
+target_cookies = $(patsubst %, $(fortune_directory)/%, $(cookies))
+target_dats = $(patsubst %, $(fortune_directory)/%.dat, $(cookies))
 
-# Each .dat file has a corresponding fortune file to be included.  This
-# apparently convoluted mess is just here to select fortune files, and not the
-# Makefile and README.
-fortune_files = $(patsubst %.dat, %, $(dat_files))
-fortune_files += $(dat_files)
-
-# `patsubst` = 'path substitution', so
-# 'ttrpg' --> /usr/share/fortune/ttrpg
-# Now `make` knows (at long last) what you want installed.
-targets = $(patsubst %, $(fortune_directory)/%, $(fortune_files))
+targets = $(target_cookies) $(target_dats)
 
 ########## Rules ##########
 
 .PHONY: install
 install: $(targets)
 
-# Ignore the `$(targets): ` section; the rule is about how to make
-# /usr/share/fortune/[that] from [this].
-# The next linen says you just install this (`$<`) from that (`$@`).
-# We use `install` rather than the more familiar `cp`, because cause back in the
-# days of Unix-yore, Xenox had a patent on the concept of a copy and
-# Mathematicians had to do their own legal work as international law hadn't been
-# established.  Now I'd like to digress from my prepared remarks to discuss how
-# I invented the terlet...
-$(targets): $(fortune_directory)/%: % | $(fortune_directory)
+$(target_cookies): $(fortune_directory)/%: %
 	install -pm644 $< $@
 
-$(fortune_directory):
-	mkdir $@
+$(target_dats): $(fortune_directory)/%.dat: %
+	strfile $< $@
 
 uninstall:
-	$(RM) $(targets)
-	! test -d $(fortune_directory) || rmdir --ignore-fail-on-non-empty $(fortune_directory)
+	$(RM) $(wildcard $(targets))