Fix builds on EL5 with system libcurl (and not libcurl-openssl)
Fix builds on EL5 with system libcurl (and not libcurl-openssl)

nwangtw/statsite,nwangtw/statsite,drawks/statsite,twitter-forks/statsite,theatrus/statsite,nwangtw/statsite,twitter-forks/statsite,nwangtw/statsite,twitter-forks/statsite,nwangtw/statsite,drawks/statsite,drawks/statsite,theatrus/statsite,drawks/statsite,theatrus/statsite,twitter-forks/statsite,theatrus/statsite,twitter-forks/statsite,drawks/statsite,twitter-forks/statsite,theatrus/statsite,nwangtw/statsite,drawks/statsite