clang-format: align consecutive macro definitions

clang-format: align consecutive macro definitions

We generally align consecutive macro definitions for better readability:

  #define OUTPUT_ANNOTATE_COMPAT      (1U<<0)
  #define OUTPUT_LONG_OBJECT_NAME     (1U<<1)
  #define OUTPUT_RAW_TIMESTAMP        (1U<<2)
  #define OUTPUT_PORCELAIN            (1U<<3)

over

  #define OUTPUT_ANNOTATE_COMPAT (1U<<0)
  #define OUTPUT_LONG_OBJECT_NAME (1U<<1)
  #define OUTPUT_RAW_TIMESTAMP (1U<<2)
  #define OUTPUT_PORCELAIN (1U<<3)

So let's add the rule in clang-format to follow this.

Signed-off-by: Karthik Nayak <redacted>
Signed-off-by: Taylor Blau <redacted>