collectd: update to 5.9.0

Update collectd to version 5.9.0

* remove backported upstream patches (sensors, modbus)
* remove lua patch that has been been implemented upstream
  (See collectd PR 3144)
* refresh patches and accommodate into upstream path changes
* place the 'stations' datatype for iwinfo in alpbetically
  correct place in types.db
* add libmnl dependency to 'processes' plugin required for the
  new Linux process Delay Accounting capability.
  (Alternatively the capability & requirement might be patched away
   in Makefile.am, HAVE_LIBTASKSTATS from collectd_4ea7a572)

* new plugins (disabled): ampq1, gpu_nvidia, pcie_errors,
                          write_stackdriver, write_syslog

compile-tested: ar71xx/WNDR3700 (all plugins)
run-tested: ar71xx/WNDR3700 (selected plugins)

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

utils/collectd/patches/400-fix-olsrd-get-all.patch

@@ -1,6 +1,6 @@
 --- a/src/olsrd.c
 +++ b/src/olsrd.c
-@@ -585,7 +585,7 @@ static int olsrd_read(void) /* {{{ */
+@@ -582,7 +582,7 @@ static int olsrd_read(void) /* {{{ */
    if (fh == NULL)
      return -1;