Merge bitcoin/bitcoin#27458: build: Detect USDT the same way how it is used in the code

b53cab0 build: Detect USDT the same way how it is used in the code (Hennadii Stepanov)

Pull request description:

  In the code we do not use string literals.

  Also a check for `DTRACE_PROBE7` macro has been added as not all systems define`DTRACE_PROBE{6,7,8,9,10,11,12}` macros (e.g., FreeBSD).

ACKs for top commit:
  0xB10C:
    ACK b53cab0

Tree-SHA512: 74f49424d57bf1929f2b09edba1449cef5a1a2448161952da35302343f3003d5bedeab1417e166b656c5f629303e2de888550b1219e886a1b991b12b9c880794

Author: fanquake

configure.ac

@@ -1409,7 +1409,9 @@ if test "$use_usdt" != "no"; then
   AC_COMPILE_IFELSE([
     AC_LANG_PROGRAM(
       [#include <sys/sdt.h>],
-      [DTRACE_PROBE("context", "event");]
+      [DTRACE_PROBE(context, event);
+       int a, b, c, d, e, f, g;
+       DTRACE_PROBE7(context, event, a, b, c, d, e, f, g);]
     )],
     [AC_MSG_RESULT([yes]); AC_DEFINE([ENABLE_TRACING], [1], [Define to 1 to enable tracepoints for Userspace, Statically Defined Tracing])],
     [AC_MSG_RESULT([no]); use_usdt=no;]