fixed the dynamic link problem with tengine in i686 box.
fixed the dynamic link problem with tengine in i686 box.

The compiler needs to know that __sync_add_and_fetch_4 is ok,
and this requires an instruction that didn't exist on i586 or i386.

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