nginx: fixed to use etc/nginx as prefix when looking for relative path files

network/nginx/nginx.conf

@@ -19,10 +19,13 @@ if [ $prefix_auto = 1 ]; then
 fi
 
 cleanconfopt=0
-confopt="--prefix=/$prefix"
 
 [[ "$sysconfdir" = */$pkg ]] || sysconfdir=$sysconfdir/$pkg
 
+# prefix used by nginx when searching for files
+confopt="--prefix=$sysconfdir"
+
+var_append confopt ' ' "--sbin-path=$sbindir"
 var_append confopt ' ' "--conf-path=$sysconfdir/nginx.conf"
 # set path to nginx.pid file
 var_append confopt ' ' "--pid-path=$localstatedir/run/nginx.pid"