Use C++ for the lua.hpp test.
Use C++ for the lua.hpp test.

Change-Id: I1d0dbb568bf6ee36a9764f0aba67b4d7839494d3
Reviewed-on: http://review.couchbase.org/13985
Reviewed-by: Aaron Miller <41fcc51335f382e0855796cc35dd33f571f2d8f7@ninjawhale.com>
Tested-by: Aaron Miller <41fcc51335f382e0855796cc35dd33f571f2d8f7@ninjawhale.com>

hsharsha/couchstore,couchbaselabs/couchstore,couchbaselabs/couchstore-specials,couchbaselabs/couchstore-specials,jimwwalker/couchstore,jimwwalker/couchstore,hsharsha/couchstore,abhinavdangeti/couchstore,jimwwalker/couchstore,vmx/couchstore,hsharsha/couchstore,vmx/couchstore,vmx/couchstore,couchbaselabs/couchstore-specials,t3rm1n4l/couchstore,t3rm1n4l/couchstore,couchbaselabs/couchstore,abhinavdangeti/couchstore,hsharsha/couchstore,t3rm1n4l/couchstore,couchbaselabs/couchstore-specials,couchbaselabs/couchstore-specials,abhinavdangeti/couchstore,couchbaselabs/couchstore