tools: remove private copies of includedir and libdir from libxenstat

They are wrong and unused.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>

tools/xenstat/libxenstat/Makefile

@@ -15,10 +15,6 @@
 XEN_ROOT=$(CURDIR)/../../..
 include $(XEN_ROOT)/tools/Rules.mk
 
-prefix=$(PREFIX)
-includedir=$(prefix)/include
-libdir=$(prefix)/lib
-
 LDCONFIG=ldconfig
 MAKE_LINK=ln -sf