clang-format: indent preprocessor directives after hash

We do not have a rule around the indentation of preprocessor directives. This was also discussed on the list [1], noting how there is often inconsistency in the styling. While there was discussion, there was no conclusion around what is the preferred style here. One style being indenting after the hash: #if FOO # if BAR # include <foo> # endif #endif The other being before the hash: #if FOO #if BAR #include <foo> #endif #endif Let's pick the former and add 'IndentPPDirectives: AfterHash' value to our '.clang-format'. There is no clear reason to pick one over the other, but it would definitely be nicer to be consistent. [1]: https://lore.kernel.org/r/xmqqwmmm1bw6.fsf@gitster.g Signed-off-by: Karthik Nayak <karthik.188@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>