[CM] Snd 13.1

[Bill Schottstaedt]

Snd 13.1:

cload.scm to automatically link in a C function from a C shared library
  this file and lint.scm are now also included in the s7 tarball.
symbol->dynamic-value

checked: gtk 3.5.12|14|16|18, clang 3.1, mpc 1.0.1

Thanks!:  Fernando, Mike, Rick, Anders.