Document our official indent style.
Notes on Coding Standards/Requirements for OpenAFS Source
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+We have an official style. Please use it. If you have gnu indent 2.2.9 or
+later you can reformat for this style with the following option:
+
+-npro -nbad -bap -nbc -bbo -br -ce -cdw -brs -ncdb -cp1 -ncs -di2 -ndj -nfc1
+-nfca -i4 -lp -npcs -nprs -psl -sc -nsob -ts8
+
Do not use $< in any cross-platform dir as it requires a reasonable
make that is not available on all systems.