nmk: Define FIND variable

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

scripts/nmk/scripts/tools.mk

@@ -17,6 +17,7 @@ MKDIR		:= mkdir -p
 AWK		:= awk
 PERL		:= perl
 PYTHON		:= python
+FIND		:= find
 SH		:= $(shell if [ -x "$$BASH" ]; then echo $$BASH;        \
                         else if [ -x /bin/bash ]; then echo /bin/bash;  \
                         else echo sh; fi ; fi)