Revision 665269

Thrift: Re-committing zlib.

Summary:
Same as the last (reverted) zlib patch,
but this time with way more awesome support for building
with no zlib headers installed.

Reviewed By: mcslee

Test Plan:
- Did lots of really pathological stuff in my VMware.
- On devrs004:
  ./bootstrap.sh && ./configure && make && make install DESTDIR=/tmp/tzinst && echo "Yay"

Revert Plan: ok