Merge pull request #270 from sappo/master

Problem: current shebang does not always work
Problem: Faulty zproject-generated code causes zyre problems in drops
Solution: Regenerate from corrected zproject
Merge pull request #271 from jemc/master

Problem: Faulty zproject-generated code causes zyre problems in drops
Problem: Android needs to provide special LDFLAGS to libtool linking
Solution: Regenerate from updated zproject
Merge pull request #272 from jemc/master

Problem: Android needs to provide special LDFLAGS to libtool linking
Problem: Multiple prelude header with the same content will colide.
Solution: Use zeromq/zproject#15 update to remove _prelude for autotools