[CM] Weirdness with s7_load_c_string_with_environment, xxd fun

[bil at ccrma.Stanford.EDU]

It's unfortunate that C (as opposed to C++) does not let
you include a string, as opposed to an array of bytes.
Or something like that -- it was awhile ago and I'm
forgetting the distinction -- I vaguely remember that the
xxd trick was not necessary in C++.