Makefile.defs: version set to 4.3.0-dev0

- developent for future major release 4.3.0 is open in master branch

Makefile.defs

@@ -163,9 +163,9 @@ INSTALL_FLAVOUR=$(FLAVOUR)
 
 # version number
 VERSION = 4
-PATCHLEVEL = 2
+PATCHLEVEL = 3
 SUBLEVEL =  0
-EXTRAVERSION = -pre1
+EXTRAVERSION = -dev0
 
 # memory manager switcher
 # 0 - f_malloc (fast malloc)