enable fvisibility=hidden for our private library

While it is a huge undertaking to enable it for our public libraries as
basically everything we exported so far could be seen as public
interface our private library is new and under our full control, so we
can do whatever we like with it. The benefits are not that big in return
of course, but it reduces the size a bit, so thats great nontheless.

Git-Dch: ignore

1 files changed, 4 insertions, 2 deletions

diff --git a/apt-private/private-upgrade.h b/apt-private/private-upgrade.h
index 64c4c0874..16bb93c9b 100644
--- a/apt-private/private-upgrade.h
+++ b/apt-private/private-upgrade.h
@@ -1,10 +1,12 @@
 #ifndef APTPRIVATE_PRIVATE_UPGRADE_H
 #define APTPRIVATE_PRIVATE_UPGRADE_H
 
+#include <apt-pkg/macros.h>
+
 class CommandLine;
 
-bool DoDistUpgrade(CommandLine &CmdL);
-bool DoUpgrade(CommandLine &CmdL);
+APT_PUBLIC bool DoDistUpgrade(CommandLine &CmdL);
+APT_PUBLIC bool DoUpgrade(CommandLine &CmdL);
 bool DoUpgradeNoNewPackages(CommandLine &CmdL);
 bool DoUpgradeWithAllowNewPackages(CommandLine &CmdL);