create target for binary file archive (linux version)

common/Makefile.common

@@ -15,6 +15,9 @@
 
 # Make sure that all is the default target
 # (The including Makefile still needs to define what 'all' is)
+
+platform = $(shell uname)
+
 all:
 
 CROSS  ?= arm-eabi-
@@ -27,6 +30,9 @@ OBJDIR	= obj
 
 INCLUDE = -I../include -I../common
 
+TAR=tar
+TARFLAGS = -C .. -rvf
+
 # Windows' echo echos its input verbatim, on Posix there is some
 #  amount of shell command line parsing going on. echo "" on 
 #  Windows yields literal "", on Linux yields an empty line