Revert removing system/ cc files, as that causes linker errors.
Revert removing system/ cc files, as that causes linker errors.

wanrui/ngx_pagespeed,0x0mar/ngx_pagespeed,digideskio/ngx_pagespeed,digideskio/ngx_pagespeed,wanrui/ngx_pagespeed,pagespeed/ngx_pagespeed,pagespeed/ngx_pagespeed,0x0mar/ngx_pagespeed