Buck: Remove jgit cell

Cross cell support in Buck is considered as experimental feature, with
number of open issues: [1], [2], [3].  Moreover, to make Maven Central
machinery work, it was needed to create symbolic links in source tree.
That broke `buck targets` feature.

Remove it for now, and re-consider to add it later.

[1] https://github.com/facebook/buck/issues/656
[2] https://github.com/facebook/buck/issues/658
[3] https://github.com/facebook/buck/issues/717

Bug: Issue 3954
Change-Id: Ic621a07771f926001df181b46b2169e214ce208a

gerrit-patch-jgit/BUCK

@@ -29,7 +29,7 @@ prebuilt_jar(
 
 genrule(
   name = 'jgit_edit_src',
-  cmd = 'unzip -qd $TMP $(location @jgit//org.eclipse.jgit:jgit_src) ' +
+  cmd = 'unzip -qd $TMP $(location //lib/jgit/org.eclipse.jgit:jgit_src) ' +
     'org/eclipse/jgit/diff/Edit.java;' +
     'cd $TMP;' +
     'zip -Dq $OUT org/eclipse/jgit/diff/Edit.java',
@@ -46,7 +46,7 @@ java_library(
   ],
   deps = [
     '//lib:gson',
-    '@jgit//org.eclipse.jgit:jgit',
+    '//lib/jgit/org.eclipse.jgit:jgit',
   ],
   visibility = ['PUBLIC'],
 )
@@ -56,8 +56,8 @@ java_test(
   srcs = glob(['src/test/java/**/*.java']),
   deps = [
     ':server',
+    '//lib/jgit/org.eclipse.jgit:jgit',
     '//lib:junit',
-    '@jgit//org.eclipse.jgit:jgit',
   ],
   source_under_test = [':server'],
   visibility = ['//tools/eclipse:classpath'],