modify the ngx_pcalloc function.
Merge pull request #214 from lnwdl/topic

modify the ngx_pcalloc function.
add "--enable-mods-shared=all" and "--enable-mods-static=all" config option.
Merge pull request #215 from monadbobo/dso_fix

add "--enable-mods-shared=all" and "--enable-mods-static=all" config opt...