perf probe: Do not show @plt function by default

Fix the perf-probe --functions option do not show the PLT
stub symbols (*@plt) by default.

  -----
  $ ./perf probe -x /usr/lib64/libc-2.33.so -F | head
  a64l
  abort
  abs
  accept
  accept4
  access
  acct
  addmntent
  addseverity
  adjtime
  -----

Reported-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Masami Hiramatsu <mhriamat@kernel.org>
Acked-by: Thomas Richter <tmricht@linux.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Stefan Liebler <stli@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Link: http://lore.kernel.org/lkml/162532653450.393143.12621329879630677469.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-probe.c

@@ -31,7 +31,7 @@
 #include <linux/zalloc.h>
 
 #define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
-#define DEFAULT_FUNC_FILTER "!_*"
+#define DEFAULT_FUNC_FILTER "!_* & !*@plt"
 #define DEFAULT_LIST_FILTER "*"
 
 /* Session management structure */