nmk: Don't redefine MAKEFLAGS

$(MAKEFLAGS) already contains -r -R and --no-print-directory: those
flags are being added in include.mk.. which is included two lines above.
There is no comment and I see no big sense in erasing $(MAKEFLAGS),
rather than adding those flags. So I considered this as a typo.

Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

scripts/nmk/Makefile

@@ -3,8 +3,6 @@ export __nmk_dir
 
 include $(__nmk_dir)include.mk
 
-MAKEFLAGS := -r -R --no-print-directory
-
 help:
 	@echo '    Targets:'
 	@echo '      install dir=<dir>  - Install scripts into directory <dir>'