component/golang: delete testdata files that have an issue with slapos.extension.strip.

component/golang/buildout.cfg

 # Go language - https://golang.org/
 [buildout]
+extends =
+  ../findutils/buildout.cfg
+
 parts = golang
 
 [golang]
@@ -12,6 +15,8 @@ configure-command = :
 location = ${buildout:parts-directory}/${:_buildout_section_name_}
 make-binary =
 make-targets= cd src && ./all.bash && cp -alf .. ${:location}
+# some testdata files have an issue with slapos.extension.strip.
+post-install = ${findutils:location}/bin/find ${:location}/src -type d -name testdata -exec rm -rf {} \; || true
 environment =
   GOROOT_FINAL=${:location}
   ${:environment-extra}