CI: fix debug_dump_set Windows skip — keep AUTORUN_TESTS compiled

My earlier Windows skip put AUTORUN_TESTS() inside the #else, so on Windows it
was not compiled — but LT_END_AUTO_TEST_ENV() expands to
'return (__lt_result__);' and __lt_result__ is declared by AUTORUN_TESTS(),
so the Windows build failed with 'littletest.hpp:46: __lt_result__ was not
declared'. Move AUTORUN_TESTS() outside the #if/#else: on Windows it is
compiled (declaring __lt_result__) but unreachable after the return 77 skip;
the ::setenv opt-in stays in the #else so the undeclared-on-mingw setenv is
never compiled there. Matches the working threadsafety_stress skip shape.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NpysYDDJac63yz2mZKKiDf

Author: etr

test/integ/debug_dump_request_body_set_test.cpp

@@ -208,6 +208,9 @@ LT_BEGIN_AUTO_TEST_ENV()
     // Opt in BEFORE the test bodies run (and BEFORE the magic-static
     // cache in the body pipeline is initialised on first dispatch).
     ::setenv("LIBHTTPSERVER_DEBUG_DUMP_REQUEST_BODY", "1", 1);
-    AUTORUN_TESTS()
 #endif
+    // Kept outside the #if/#else so AUTORUN_TESTS() (which declares the
+    // __lt_result__ that LT_END_AUTO_TEST_ENV returns) is always compiled;
+    // on Windows it is unreachable after the return 77 above.
+    AUTORUN_TESTS()
 LT_END_AUTO_TEST_ENV()