Fix detect gzip compress for squashfs-tools.

pym/cl_utils.py

@@ -1047,6 +1047,12 @@ def getSquashList():
     if not usesSquashFs:
         return ["gzip"]
     else:
+        pkgInfo = getPkgInstalled('sys-fs/squashfs-tools')
+        if pkgInfo and pkgInfo[0]['PV']:
+            pkgVer = getTupleVersion(pkgInfo[0]['PV'])
+            gzipVer = getTupleVersion('4.2')
+            if pkgVer >= gzipVer:
+                usesSquashFs.append('gzip')
         return map(lambda x:{"lzma":"xz"}.get(x,x),
                list(set(usesSquashFs) & wantMethod))