Update the list of tests that don't work on Minix.

While there, remove CC (configure will now find clang) and make the test
list easier to update via cut and paste.

.github/configs

@@ -142,17 +142,17 @@ case "${TARGET_HOST}" in
 	SKIP_LTESTS="forwarding multiplex proxy-connect hostkey-agent agent-ptrace"
 	;;
     minix3)
-	CC="clang"
 	LIBCRYPTOFLAGS="--without-openssl --disable-security-key"
 	# Minix does not have a loopback interface so we have to skip any
-	# test that relies on it.
+	# test that relies on one.
+	T="addrmatch brokenkeys cfgmatch cfgmatchlisten cfgparse connect
+	    connect-uri exit-status forward-control forwarding hostkey-agent
+	    key-options keyscan knownhosts-command login-timeout multiplex
+	    reconfigure reexec rekey scp scp-uri scp3 sftp sftp-badcmds
+	    sftp-batch sftp-cmds sftp-glob sftp-perm sftp-uri stderr-data
+	    transfer"
+	SKIP_LTESTS="$(echo $T)"
 	TEST_TARGET=t-exec
-	SKIP_LTESTS="addrmatch cfgparse key-options reexec agent connect"
-	SKIP_LTESTS="$SKIP_LTESTS keyscan rekey allow-deny-users connect-uri"
-	SKIP_LTESTS="$SKIP_LTESTS knownhosts-command sftp-uri brokenkeys"
-	SKIP_LTESTS="$SKIP_LTESTS exit-status login-timeout stderr-data"
-	SKIP_LTESTS="$SKIP_LTESTS cfgmatch forward-control multiplex transfer"
-	SKIP_LTESTS="$SKIP_LTESTS cfgmatchlisten forwarding reconfigure"
 	SUDO=""
 	;;
     nbsd4)