Including Git commit-id as string inside C files

Code: https://github.com/google/honggfuzz/commit/2310ab5f6954cbe4ebaca25ca0a52c72bd4103c5

Including contents of a text-file as a string in C is not that easy, esp. if it's not surrounded by quotes. One cannot simply write

  static const char str[] = 
  #include "file"
  ;

and

  static const char str[] = " 
  #include "file"
  ";

will not work either.

If you know of a better (cleaner/shorter/less-hacky) way of doing this, and w/o external scripts/bins like `xxd -i` please let me know.