Update build_ngx_pagespeed_from_source.html (#2021)
Update build_ngx_pagespeed_from_source.html (#2021)

Simplify a bit the manual compilation by avoiding temporary files and guessing some filenames.

Note: Currently it still contains a lot of legacy code. I suggest to have the build instruction under source control. This would not only be expected, it'd also avoid having this script remain backward compatible.
pagespeed/mod_pagespeed,pagespeed/mod_pagespeed,pagespeed/mod_pagespeed,pagespeed/mod_pagespeed,pagespeed/mod_pagespeed,pagespeed/mod_pagespeed,pagespeed/mod_pagespeed