testsuite: use binary output mode for custom curl test tools

Do not try to convert line-endings to CRLF on Windows by setting stdout
to binary mode, just like the curl tool does if --ascii is not specified.

This should prevent corrupted stdout line-ending output like CRCRLF.

In order to make the previously naive text-aware tests work with
binary mode on Windows, text-mode is disabled for them if it is not
actually part of the test case and line-endings are corrected.

tests/data/test509

@@ -28,7 +28,7 @@ nothing
 #
 # Verify data after the test has been "shot"
 <verify>
-<stdout mode="text">
+<stdout>
 seen custom_calloc()
 seen custom_malloc()
 seen custom_realloc()