Removed the testsuite build flag

Test suite is always included.

Building with this flag disabled has actually been broken for some time,
since Command.TestRemote uses tasty. Fewer build flags are better, so good
time to drop it.

This commit was sponsored by Thomas Hochstein on Patreon.

BuildInfo.hs

@@ -33,11 +33,6 @@ buildFlags = filter (not . null)
 #else
 #warning Building without local pairing.
 #endif
-#ifdef WITH_TESTSUITE
-	, "Testsuite"
-#else
-#warning Building without the testsuite.
-#endif
 #ifdef WITH_S3
 	, "S3"
 #if MIN_VERSION_aws(0,10,6)
@@ -83,6 +78,7 @@ buildFlags = filter (not . null)
 	-- Always enabled now, but users may be used to seeing these flags
 	-- listed.
 	, "Feeds"
+	, "Testsuite"
 	]
 
 -- Not a complete list, let alone a listing transitive deps, but only