build: prereq: change minimum make version to 3.82

undefine was added in make 3.82 which is now some 10 years ago, some
make scripts are beginning to use 'undefine'

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

include/prereq-build.mk

@@ -14,8 +14,8 @@ PKG_NAME:=Build dependency
 
 # Required for the toolchain
 $(eval $(call TestHostCommand,working-make, \
-	Please install GNU make v3.81 or later. (This version has bugs), \
-	$(MAKE) -v | grep -E 'Make (3\.8[1-9]|3\.9[0-9]|[4-9]\.)'))
+	Please install GNU make v3.82 or later. (This version has bugs), \
+	$(MAKE) -v | grep -E 'Make (3\.8[2-9]|3\.9[0-9]|[4-9]\.)'))
 
 $(eval $(call TestHostCommand,case-sensitive-fs, \
 	OpenWrt can only be built on a case-sensitive filesystem, \