Merge bitcoin/bitcoin#28693: build: Include config/bitcoin-config.h explicitly in util/trace.h

6bdff42 build: Include `config/bitcoin-config.h` explicitly in `util/trace.h` (Hennadii Stepanov)

Pull request description:

  The `ENABLE_TRACING` macro is expected to be defined in the `config/bitcoin-config.h` header.

  Therefore, the current code is error-prone as it depends on whether the `config/bitcoin-config.h` header was included before or not.

  This bug was noticed while working on CMake [stuff](hebasto/bitcoin#37).

ACKs for top commit:
  fanquake:
    ACK 6bdff42

Tree-SHA512: 22c4fdeb51628814050eb99a83db4268a4f3106207eeef918a07214bbc52f2b22490f6b05fcb96216f147afa4197c51102503738131e2583e750b6d195747a49

Author: fanquake

src/util/trace.h

@@ -5,6 +5,10 @@
 #ifndef BITCOIN_UTIL_TRACE_H
 #define BITCOIN_UTIL_TRACE_H
 
+#if defined(HAVE_CONFIG_H)
+#include <config/bitcoin-config.h>
+#endif
+
 #ifdef ENABLE_TRACING
 
 #include <sys/sdt.h>