libraw: fix deps

Jasper is picked up as an undeclared dependency if present, so add it.
lcms2 isn't found without pkg-config, so add it.
libraw: build packs out of separate folders

Downloading the two paths to the build root works, but clobbers libraw's
own meta files.

Build the packs out of separate folders to keep original meta files.
figlet: style nits