* lisp/ob-lilypond.el (org-babel-lilypond-OSX-ly-path,
org-babel-lilypond-OSX-pdf-path, org-babel-lilypond-OSX-midi-path,
org-babel-lilypond-nix-ly-path, org-babel-lilypond-nix-pdf-path,
org-babel-lilypond-nix-midi-path, org-babel-lilypond-w32-ly-path,
org-babel-lilypond-w32-pdf-path, org-babel-lilypond-w32-midi-path,
org-babel-lilypond-determine-ly-path,
org-babel-lilypond-determine-pdf-path,
org-babel-lilypond-determine-midi-path): Remove.
(org-babel-lilypond-ly-command, org-babel-lilypond-midi-command,
org-babel-lilypond-pdf-command): Replacement for removed variables
and functions. Adapt all calls to the removed functions to use
these variables instead.
(org-babel-lilypond-commands): New defcustom for setting up
the *-command variables. Keep different defaults for different
systems as the original code did to avoid tripping up unsuspecting
users.
(org-babel-lilypond-execute-tangled-ly,
org-babel-lilypond-check-for-compile-error): Revert conditions to
avoid superfluous forms. Remove unused return values.
* testing/lisp/test-ob-lilypond.el: Do test for new variables and
replace removed function calls with the appropriate variable
content. Exercise the new defcustom thoroughly.
64821bd967