Silence sparse warning for version.c

version.c:1:12: warning: symbol 'version' was not declared. Should it be static?

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

Makefile.main

@@ -303,6 +303,7 @@ version.c: $(SRC)/make_version.sh $(OBJS_NO_VER) .version
 	@(if [ "a$(VERSION)" = "a" ]; then \
 		echo "#error You need to set SKIBOOT_VERSION environment variable" > $@ ;\
         else \
+		echo "extern const char version[];"; \
                 echo "const char version[] = \"$(VERSION)\";" ;\
         fi) > $@
 

core/init.c

@@ -57,6 +57,7 @@
 enum proc_gen proc_gen;
 unsigned int pcie_max_link_speed;
 bool verbose_eeh;
+extern const char version[];
 
 static uint64_t kernel_entry;
 static size_t kernel_size;