build: make dist no longer includes root-level bootstrap.sh. this should help users of release tarballs avoid confusion.

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@987017 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/Makefile.am b/Makefile.am
index 29648a0..f1f79ac 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -24,5 +24,5 @@
 dist-hook:
 	find $(distdir) -name '.[a-zA-Z0-9]*' | xargs rm -rf
 
-EXTRA_DIST = bootstrap.sh cleanup.sh doc tutorial contrib \
+EXTRA_DIST = doc tutorial contrib \
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