[snapshot] Adding file path for new zjs_common.c (#592)

Fixes issue #588 where snapshot was failing to build since it
didn't have the path to the new zjs_common.c file.

Signed-off-by: Brian J Jones <[email protected]>

Author: brianjjones

Makefile.snapshot

@@ -25,6 +25,7 @@ setup:
 	fi
 
 CORE_SRC +=		src/snapshot.c \
+			src/zjs_common.c \
 			src/zjs_script.c
 
 CORE_OBJ =		$(CORE_SRC:%.c=%.o)