remove unneeded check against running make in tlm/

Change-Id: Ie5916ffbaf85a0e7abc36a8079334cdd94b59467
Reviewed-on: http://review.membase.org/5550
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Steve Yen <steve.yen@gmail.com>

Makefile.top

@@ -2,10 +2,6 @@
 TOPDIR := $(shell pwd)
 PREFIX := $(TOPDIR)/install
 
-ifeq "$(realpath tlm/Makefile)" ""
-$(error You need to be in top-level directory to use top-level makefile)
-endif
-
 COMPONENTS := bucket_engine \
 	ep-engine \
 	libconflate \