Function btck_block_header_create 

pub unsafe extern "C" fn btck_block_header_create(
    raw_block_header: *const c_void,
    raw_block_header_len: usize,
) -> *mut btck_BlockHeader

@brief Create a btck_BlockHeader from serialized data.

@param[in] raw_block_header Non-null, serialized header data (80 bytes) @param[in] raw_block_header_len Length of serialized header (must be 80) @return btck_BlockHeader, or null on error.