Added make target for upload example

examples/Makefile

@@ -4,5 +4,6 @@ all:
 	OS=`uname`; \
 	  test "$$OS" = Linux && LIBS="-ldl" ; \
 	  $(CC) $(CFLAGS) hello.c ../mongoose.c  $$LIBS $(ADD) -o hello;
+	  $(CC) $(CFLAGS) upload.c ../mongoose.c  $$LIBS $(ADD) -o upload;
 	  $(CC) $(CFLAGS) post.c ../mongoose.c  $$LIBS $(ADD) -o post;
 	  $(CC) $(CFLAGS) chat.c ../mongoose.c  $$LIBS $(ADD) -o chat