version: rename c-ares-rr to asyn-rr

Works better if we later introduce another way to do the asynch RR
resolves (together with the threaded resolver) that does not use c-ares.

Closes #16090

tests/FILEFORMAT.md

@@ -436,10 +436,10 @@ Features testable here are:
 
 - `alt-svc`
 - `AppleIDN`
+- `asyn-rr` - c-ares is used for additional records only
 - `bearssl`
 - `brotli`
 - `c-ares` - c-ares is used for (all) name resolves
-- `c-ares-rr` - c-ares is used for additional records only
 - `CharConv`
 - `codeset-utf8`. If the running codeset is UTF-8 capable.
 - `cookies`

tests/runtests.pl

@@ -699,7 +699,7 @@ sub checksystemfeatures {
             # Thread-safe init
             $feature{"threadsafe"} = $feat =~ /threadsafe/i;
             $feature{"HTTPSRR"} = $feat =~ /HTTPSRR/;
-            $feature{"c-ares-rr"} = $feat =~ /c-ares-rr/;
+            $feature{"asyn-rr"} = $feat =~ /asyn-rr/;
         }
         #
         # Test harness currently uses a non-stunnel server in order to