Don't hardcode easy mesh version in local Makefile

Signed-off-by: Filip Matusiak <filip.matusiak@iopsys.eu>

src/Makefile

 EXECS = mapcontroller
-CFLAGS+=-I. -Iutils -D_GNU_SOURCE -DEASYMESH_VERSION=4
+CFLAGS+=-I. -Iutils -D_GNU_SOURCE
 CFLAGS+= -g -Wall -Werror
 
 OBJS = \