perf: install trace-event plugins

perf hardcodes $libdir to be lib for all but x86_64, so kludge around it
until upstream gets their act together.

--kyle

perf-lib64.patch

@@ -0,0 +1,17 @@
+diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
+index 802cf54..7f30bfa 100644
+--- a/tools/perf/config/Makefile
++++ b/tools/perf/config/Makefile
+@@ -621,8 +621,12 @@ endif
+ ifeq ($(IS_X86_64),1)
+ lib = lib64
+ else
++ifdef MULTILIBDIR
++lib = $(MULTILIBDIR)
++else
+ lib = lib
+ endif
++endif
+ libdir = $(prefix)/$(lib)
+
+ # Shell quote (do not use $(call) to accommodate ancient setups);