Modernize add-dsym test Makefile

(cherry picked from commit 2ff545e)

Author: fredriss

lldb/packages/Python/lldbsuite/test/macosx/add-dsym/Makefile

@@ -1,24 +1,14 @@
-CC ?= clang
-ifeq "$(ARCH)" ""
-	ARCH = x86_64
-endif
-
-ifeq "$(OS)" ""
-	OS = $(shell uname -s)
-endif
+C_SOURCES = main.c
 
-CFLAGS ?= -g -O0
+include Makefile.rules
 
-ifeq "$(OS)" "Darwin"
-	CFLAGS += -arch $(ARCH)
-endif
+all: a.out.dSYM hide.app/Contents/a.out.dSYM
 
-all: main.c clean
+hide.app/Contents/a.out.dSYM:
 	mkdir hide.app
 	mkdir hide.app/Contents
-	$(CC) $(CFLAGS) -g $<
 	mv a.out.dSYM hide.app/Contents
 	strip -x a.out
-
-clean:
-	rm -rf a.out a.out.dSYM hide.app
+ifneq "$(CODESIGN)" ""
+	$(CODESIGN) -fs - a.out
+endif