bazel: don't expose jsch and jzlib to org.eclipse.jgit

These libraries are no longer used by org.eclipse.jgit since the code
depending on them was moved to org.eclipse.jgit.ssh.jsch.

Change-Id: Ic1c66e8ca06d904abf44d84154bbe9a770aa94d5
diff --git a/lib/BUILD b/lib/BUILD
index d6cdccb..1901be8 100644
--- a/lib/BUILD
+++ b/lib/BUILD
@@ -148,7 +148,6 @@
 java_library(
     name = "jsch",
     visibility = [
-        "//org.eclipse.jgit:__pkg__",
         "//org.eclipse.jgit.junit.ssh:__pkg__",
         "//org.eclipse.jgit.ssh.jsch:__pkg__",
         "//org.eclipse.jgit.ssh.jsch.test:__pkg__",
@@ -198,7 +197,6 @@
 java_library(
     name = "jzlib",
     visibility = [
-        "//org.eclipse.jgit:__pkg__",
         "//org.eclipse.jgit.ssh.jsch:__pkg__",
         "//org.eclipse.jgit.test:__pkg__",
     ],