collectd: update to 5.7.1

Update collectd to version 5.7.1

* replace 003-remove-werror.patch with configure option
* remove 200-fix-git-describe-error.patch that is now unnecessary
* reformat other patches due to whitespace changes
* add new plugins to the list as disabled

* correct download & homepage links
* add myself as the second maintainer

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

utils/collectd/patches/600-fix-libmodbus-detection.patch

@@ -18,7 +18,7 @@ Reversed patch to be applied:
 
 --- a/configure.ac
 +++ b/configure.ac
-@@ -2627,7 +2627,7 @@ then
+@@ -3186,7 +3186,7 @@ then
  	SAVE_CPPFLAGS="$CPPFLAGS"
  	CPPFLAGS="$CPPFLAGS $with_libmodbus_cflags"