Repair software release tests

* [slapos-master](https://nexedijs.erp5.net/#/test_result_module/20210629-DE509CB3/23) is failing in checkSoftware step, because:
  * wcfs is linked against system zlib (fixed in this MR)
  * the .so in the build directory have missing references. I think we don't need to check in build folders and also liblibgolang is missing, but it's not a problem because of the way we load dynamically at runtime, so I suggest changing checkSoftware in nexedi/slapos.core!317
* [gitlab](https://nexedijs.erp5.net/#/test_result_module/20210629-DE509CB3/10) is failing for some time because mimemagic have been yanked from rubygems. This is a minimal change to get the test running again, to prevent other problems to sneak in while we don't have tests

See merge request nexedi/slapos!1007

component/wendelin.core/buildout.cfg

@@ -38,6 +38,12 @@ GO   = ${go:exe}
 # wcfs needs this:
 [gowork]
 cpkgpath += ${zlib:location}/lib/pkgconfig
+[wendelin.core-env]
+# `pkg-config --libs zlib` emits only -L, but not -Wl,-rpath
+# better set it via gowork:environment when "VAR += ..." support is there
+# environment +=
+#   CGO_LDFLAGS += -Wl,-rpath=${zlib:location}/lib
+CGO_LDFLAGS += -Wl,-rpath=${zlib:location}/lib
 
 
 [wendelin.core-repository]

software/gitlab/software.cfg

@@ -134,7 +134,7 @@ git-executable = ${git:location}/bin/git
 <= git-repository
 repository = https://lab.nexedi.com/nexedi/gitlab-ce.git
 # 9.5.10 + NXD patches:
-revision = v9.5.10-8-gc290e22a08cb
+revision = v9.5.10-9-g69b0ffae00bf
 location = ${buildout:parts-directory}/gitlab
 
 [gitlab-shell-repository]