fix/proftpd: socket created in software

See merge request nexedi/slapos!845

component/proftpd/buildout.cfg

@@ -32,7 +32,8 @@ configure-options =
   --disable-cap
   --with-modules=mod_sftp:mod_ban
   --prefix=${buildout:parts-directory}/${:_buildout_section_name_}
-environment = 
+environment =
+  CFLAGS=-DPR_RUN_DIR=\"/proc/self/cwd/var\"
   CPPFLAGS=-I${zlib:location}/include -I${openssl:location}/include
   LDFLAGS=-L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib
   install_user=${proftpd-environment:USER}