MDEV-7369: MariaDB build fails when XTRADB_STORAGE_ENGINE enabled

Patch by James Taylor.

storage/xtradb/include/os0stacktrace.h

@@ -20,7 +20,7 @@ this program; if not, write to the Free Software Foundation, Inc.,
 #ifndef os0stacktrace_h
 #define os0stacktrace_h
 
-#ifdef __linux__
+#if defined (__linux__) && HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS
 #if HAVE_EXECINFO_H
 #include <execinfo.h>
 #endif
@@ -40,5 +40,5 @@ os_stacktrace_print(
 	siginfo_t* info,     /*!< in: signal information */
 	void*      ucontext);/*!< in: signal context */
 
-#endif /*  __linux__ */
+#endif /* defined (__linux__) && HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS */
 #endif /* os0stacktrace.h */

storage/xtradb/srv/srv0start.c

@@ -1274,7 +1274,7 @@ innobase_start_or_create_for_mysql(void)
 	stacktrace feature. */
 
 	if (srv_use_stacktrace) {
-#ifdef __linux__
+#if defined (__linux__) && HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS
 		 struct sigaction sigact;
 
 		 sigact.sa_sigaction = os_stacktrace_print;
@@ -1287,7 +1287,7 @@ innobase_start_or_create_for_mysql(void)
 			 srv_use_stacktrace = FALSE;
 
 		 }
-#endif /* __linux__ */
+#endif /* defined (__linux__) && HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS */
 	}