fix lua 5.2 version check in luabackend
re-fix compilation for new polarssl
make luabackend respect LUA_LIBS instead of forcing -llua5.1
Merge pull request #1126 from mind04/libcurl

remotebackend libcurl linking
allow overriding MAKE in regression tests
presumably fix building on os x 10.9, thanks @mactijn
drop unused vars, thanks Morten Stevens
Merge pull request #1142 from mind04/buildscripts

Buildscripts
return NOTIMP for direct RRSIG request
re-enable bind hybrid support