xxx component/cryptopp: do not use version anymore

component/cryptopp/buildout.cfg

@@ -4,10 +4,10 @@ parts =
 
 [cryptopp]
 recipe = slapos.recipe.cmmi
+location = ${buildout:parts-directory}/${:_buildout_section_name_}
 version = 5.6.3
 url = https://github.com/weidai11/cryptopp/archive/CRYPTOPP_5_6_3.tar.gz
 md5sum = 5bad00942de603ba6dd191d84eac2509
-location = ${buildout:parts-directory}/cryptopp-${:version}
 configure-command = true
 make-options = PREFIX=${:location}
 make-targets = static shared install