tests: always make bundles, adapt build and tests

Make test bundles the default. Drop non-bundle build mode.
Also do all the optimizations and tidy-ups this allows, simpler builds,
less bundle exceptions, streamlined build mechanics.

Also rework the init/deinit macro magic for unit tests. The new method
allows using unique init/deinit function names, and calling them with
arguments. This is in turn makes it possible to reduce the use of global
variables.

Note this drop existing build options `-DCURL_TEST_BUNDLES=` from cmake
and `--enable-test-bundles` / `--disable-test-bundles` from autotools.

Also:
- rename test entry functions to have unique names: `test_<testname>`
  This removes the last exception that was handled in the generator.
- fix `make dist` to not miss test sources with test bundles enabled.
- sync and merge `tests/mk-bundle.pl` into `scripts/mk-unity.pl`.
- mk-unity.pl: add `--embed` option and use it when `CURL_CLANG_TIDY=ON`
  to ensure that `clang-tidy` does not miss external test C sources.
  (because `clang-tidy` ignores code that's #included.)
- tests/unit: drop no-op setup/stop functions.
- tests: reduce symbol scopes, global macros, other fixes and tidy-ups.
- tool1621: fix to run, also fix it to pass.
- sockfilt: fix Windows compiler warning in certain unity include order,
  by explicitly including `warnless.h`.

Follow-up to 6897aeb105 #17468

Closes #17590

tests/unit/unit1658.c

@@ -25,35 +25,22 @@
 
 #include "doh.h" /* from the lib dir */
 
-static CURLcode unit_setup(void)
+/* DoH + HTTPSRR are required */
+#if !defined(CURL_DISABLE_DOH) && defined(USE_HTTPSRR)
+
+static CURLcode t1658_setup(void)
 {
   /* whatever you want done first */
   curl_global_init(CURL_GLOBAL_ALL);
   return CURLE_OK;
 }
 
-static void unit_stop(void)
-{
-  curl_global_cleanup();
-  /* done before shutting down and exiting */
-}
-
-/* DoH + HTTPSRR are required */
-#if !defined(CURL_DISABLE_DOH) && defined(USE_HTTPSRR)
-
 extern CURLcode doh_resp_decode_httpsrr(struct Curl_easy *data,
                                         const unsigned char *cp, size_t len,
                                         struct Curl_https_rrinfo **hrr);
 extern void doh_print_httpsrr(struct Curl_easy *data,
                               struct Curl_https_rrinfo *hrr);
 
-struct test {
-  const char *name;
-  const unsigned char *dns;
-  size_t len; /* size of the dns packet */
-  const char *expect;
-};
-
 /*
  * The idea here is that we pass one DNS packet at the time to the decoder. we
  * then generate a string output with the results and compare if it matches
@@ -127,12 +114,21 @@ static void rrresults(struct Curl_https_rrinfo *rr, CURLcode result)
   }
 }
 
-UNITTEST_START
+static CURLcode test_unit1658(char *arg)
 {
+  UNITTEST_BEGIN(t1658_setup())
+
   /* The "SvcParamKeys" specified within the HTTPS RR packet *must* be
      provided in numerical order. */
 
-  static struct test t[] = {
+  struct test {
+    const char *name;
+    const unsigned char *dns;
+    size_t len; /* size of the dns packet */
+    const char *expect;
+  };
+
+  static const struct test t[] = {
     {
       "single h2 alpn",
       (const unsigned char *)"\x00\x00" /* 16-bit prio */
@@ -541,13 +537,16 @@ UNITTEST_START
     }
     curl_easy_cleanup(easy);
   }
+
+  UNITTEST_END(curl_global_cleanup())
 }
-UNITTEST_STOP
 
 #else /* CURL_DISABLE_DOH or not HTTPSRR enabled */
 
-UNITTEST_START
-/* nothing to do, just succeed */
-UNITTEST_STOP
+static CURLcode test_unit1658(char *arg)
+{
+  UNITTEST_BEGIN_SIMPLE
+  UNITTEST_END_SIMPLE
+}
 
 #endif