slapos/obs: Force gcc from slapos

It's required to fetch all dependencies in all cases, as tarball preparation
can happen on machine, on which gcc would be used from OS, but in the end
package building can happen on machines without proper gcc.

component/slapos/obs.cfg

@@ -13,6 +13,12 @@ extensions =
 extends-cache = extends-cache
 download-cache = download-cache
 
+[gcc]
+# force usage of gcc from slapos
+# it's required during tarball preparation, to have all dependencies
+# downloaded
+min_version = 1000
+
 # Uguu, upstream buildout.cfg must be patched as it works the other way
 # around from a packager point of view at least, thus at the end static
 # path, such as Python HOME directory, are wrong...