Add symbol option to Makefile

This option allows one to build LiME without stripping symbols.
When using Volatility you can use dwarf on LiME to build the needed
profile.

doc/README.md

@@ -4,6 +4,7 @@
   * [Linux](#Linux)
   * [External](#External)
   * [Debug](#Debug)
+  * [Symbols](#Symbols)
   * [Android](#Android)
 * [Usage](#Usage)
   * [Parameters](#Params)
@@ -23,6 +24,9 @@ LiME can be compiled externally from the target in order to provide a more foren
 ### Debug  <a name="Debug"/>
 When compiling LiME with the default Makefile, using the command “make debug” will compile a LiME module with extra debug output.  The output can be read by using the dmesg command on Linux.
 
+### Symbols  <a name="Symbols"/>
+When compiling LiME with the default Makefile, using the command “make symbols" will compile a LiME module without stripping symbols. This is useful for tools such as Volatility where one can create a profile without loading second module.
+
 ### Android <a name="Android"/>
 In order to cross-compile LiME for use on an Android device, additional steps are required.
 

src/Makefile

@@ -41,6 +41,10 @@ debug:
 	strip --strip-unneeded lime.ko
 	mv lime.ko lime-$(KVER).ko
 
+symbols:
+	$(MAKE) -C $(KDIR) M="$(PWD)" modules
+	mv lime.ko lime-$(KVER).ko
+
 modules:    main.c disk.c tcp.c hash.c lime.h
 	$(MAKE) -C /lib/modules/$(KVER)/build M="$(PWD)" $@
 	strip --strip-unneeded lime.ko