feat: remove LZO support

LZO support requires the github.com/rasky/go-lzo module, which is GPLv2
licensed and thus not suitable for inclusion in some projects (see
discussion in anchore/stereoscope#125).

Signed-off-by: Adam Hughes <9903835+tri-adam@users.noreply.github.com>

go.mod

@@ -16,7 +16,6 @@ require (
 require (
 	github.com/golang/snappy v0.0.3 // indirect
 	github.com/google/go-cmp v0.5.5 // indirect
-	github.com/rasky/go-lzo v0.0.0-20200203143853-96a758eda86e
 	github.com/therootcompany/xz v1.0.1
 	go.lsp.dev/uri v0.3.0 // indirect
 	gopkg.in/ini.v1 v1.62.0 // indirect

go.sum

@@ -156,8 +156,6 @@ github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y8
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
-github.com/rasky/go-lzo v0.0.0-20200203143853-96a758eda86e h1:dCWirM5F3wMY+cmRda/B1BiPsFtmzXqV9b0hLWtVBMs=
-github.com/rasky/go-lzo v0.0.0-20200203143853-96a758eda86e/go.mod h1:9leZcVcItj6m9/CfHY5Em/iBrCz7js8LcRQGTKEEv2M=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=

reader.go

@@ -65,7 +65,7 @@ func NewReader(r io.ReaderAt) (*Reader, error) {
 	case LZMACompression:
 		squash.d = decompress.Lzma{}
 	case LZOCompression:
-		squash.d = decompress.Lzo{}
+		return nil, errors.New("LZO compression not supported")
 	case XZCompression:
 		squash.d = decompress.Xz{}
 	case LZ4Compression: