Server doesn't build with GCOV by GCC 11+

/usr/bin/ld: libdbug.a(dbug.c.o): in function `_db_suicide_':

/data/src/10.6-bug/dbug/dbug.c:2215: undefined reference to `__gcov_flush'

/usr/bin/ld: libdbug.a(dbug.c.o): in function `_db_my_assert':

/data/src/10.6-bug/dbug/dbug.c:2265: undefined reference to `__gcov_flush'

collect2: error: ld returned 1 exit status

make[2]: *** [dbug/CMakeFiles/tests.dir/build.make:104: dbug/tests] Error 1

make[1]: *** [CMakeFiles/Makefile2:8982: dbug/CMakeFiles/tests.dir/all] Error 2

make[1]: *** Waiting for unfinished jobs....

diff --git a/dbug/dbug.c b/dbug/dbug.c

index a6d893e3f49..45809c521d6 100644

--- a/dbug/dbug.c

+++ b/dbug/dbug.c

@@ -86,7 +86,7 @@

 #include <m_string.h>

 #include <errno.h>

 #ifdef HAVE_gcov

-extern void __gcov_flush();

+extern void __gcov_dump();

 #endif

 #ifndef DBUG_OFF

@@ -2212,7 +2212,7 @@ void _db_suicide_()

   fprintf(stderr, "SIGKILL myself\n");

   fflush(stderr);

 #ifdef HAVE_gcov

-  __gcov_flush();

+  __gcov_dump();

 #endif

   retval= kill(getpid(), SIGKILL);

@@ -2262,7 +2262,7 @@ my_bool _db_my_assert(const char *file, int line, const char *msg)

     fprintf(stderr, "%s:%d: assert: %s\n", file, line, msg);

     fflush(stderr);

 #ifdef HAVE_gcov

-    __gcov_flush();

+    __gcov_dump();

 #endif

   }

   return a;

diff --git a/mysys/stacktrace.c b/mysys/stacktrace.c

index 844d8a0b28f..42a8c5f192e 100644

--- a/mysys/stacktrace.c

+++ b/mysys/stacktrace.c

@@ -410,7 +410,7 @@ void my_print_stacktrace(uchar* stack_bottom, ulong thread_stack,

 void my_write_core(int sig)

 {

 #ifdef HAVE_gcov

-  extern void __gcov_flush(void);

+  extern void __gcov_dump(void);

 #endif

   signal(sig, SIG_DFL);

 #ifdef HAVE_gcov

@@ -419,7 +419,7 @@ void my_write_core(int sig)

     information from this process, causing gcov output to be incomplete.

     So we force the writing of coverage information here before terminating.

   */

-  __gcov_flush();

+  __gcov_dump();

 #endif

   pthread_kill(pthread_self(), sig);

 #if defined(P_MYID) && !defined(SCO)