Ensure versions of libtraceevent and libtracefs have 3 components.

Fixes: https://bugs.gentoo.org/917559

--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -1163,7 +1163,7 @@ ifneq ($(NO_LIBTRACEEVENT),1)
   ifeq ($(feature-libtraceevent), 1)
     CFLAGS += -DHAVE_LIBTRACEEVENT
     EXTLIBS += -ltraceevent
-    LIBTRACEEVENT_VERSION := $(shell $(PKG_CONFIG) --modversion libtraceevent)
+    LIBTRACEEVENT_VERSION := $(shell $(PKG_CONFIG) --modversion libtraceevent).0
     LIBTRACEEVENT_VERSION_1 := $(word 1, $(subst ., ,$(LIBTRACEEVENT_VERSION)))
     LIBTRACEEVENT_VERSION_2 := $(word 2, $(subst ., ,$(LIBTRACEEVENT_VERSION)))
     LIBTRACEEVENT_VERSION_3 := $(word 3, $(subst ., ,$(LIBTRACEEVENT_VERSION)))
@@ -1177,7 +1177,7 @@ ifneq ($(NO_LIBTRACEEVENT),1)
   $(call feature_check,libtracefs)
   ifeq ($(feature-libtracefs), 1)
     EXTLIBS += -ltracefs
-    LIBTRACEFS_VERSION := $(shell $(PKG_CONFIG) --modversion libtracefs)
+    LIBTRACEFS_VERSION := $(shell $(PKG_CONFIG) --modversion libtracefs).0
     LIBTRACEFS_VERSION_1 := $(word 1, $(subst ., ,$(LIBTRACEFS_VERSION)))
     LIBTRACEFS_VERSION_2 := $(word 2, $(subst ., ,$(LIBTRACEFS_VERSION)))
     LIBTRACEFS_VERSION_3 := $(word 3, $(subst ., ,$(LIBTRACEFS_VERSION)))