BACKPORT: libtraceevent: Fix build with binutils 2.35

In binutils 2.35, 'nm -D' changed to show symbol versions along with
symbol names, with the usual @@ separator.  When generating
libtraceevent-dynamic-list we need just the names, so strip off the
version suffix if present.

Signed-off-by: Ben Hutchings <[email protected]>
Tested-by: Salvatore Bonaccorso <[email protected]>
Reviewed-by: Steven Rostedt <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
(cherry picked from commit 39efdd9)

Conflicts:
	tools/lib/traceevent/plugins/Makefile

Change-Id: Icec6ced8322a4e0a2aafe4edcb133b0335764032
Signed-off-by: Jeffy Chen <[email protected]>
Signed-off-by: Caesar Wang <[email protected]>

tools/lib/traceevent/Makefile

@@ -251,7 +251,7 @@ endef
 
 define do_generate_dynamic_list_file
 	(echo '{';							\
-	$(NM) -u -D $1 | awk 'NF>1 {print "\t"$$2";"}' | sort -u;	\
+	$(NM) -u -D $1 | awk 'NF>1 {sub("@.*", "", $$2); print "\t"$$2";"}' | sort -u;	\
 	echo '};';							\
 	) > $2
 endef