recipes/md/to-html/Makefile: quote $@, $<
recipes/ogv/crop/Makefile: quote $@, $<
recipes/flac/to-mp3/Makefile: quote $@, $<
recipes/cue/split/Makefile: quote $@, $<
recipes/ogv/to-gif/Makefile: quote $@, $<
recipes/svg/to-png/Makefile: quote $@, $<
recipes/ogv/trim/Makefile: quote $@, $<

Fixes #2.