Makefile.defs: version set to 4.0.0-rc1

Makefile.defs

@@ -163,7 +163,7 @@ INSTALL_FLAVOUR=$(FLAVOUR)
 VERSION = 4
 PATCHLEVEL = 0
 SUBLEVEL =  0
-EXTRAVERSION = -rc0
+EXTRAVERSION = -rc1
 
 # memory manager switcher
 # 0 - f_malloc (fast malloc)