added an impl of dl-iterate-phdr to libzestcfi so it doesn't have to call libc's version

Former-commit-id: f7d6cea61208d2149e6ddffd052412ac16b84b70

tools/selective_cfi/tests/test_libc.sh

@@ -75,9 +75,9 @@ main()
 {
 	build
 	protect
-#	get_correct
-#	report
-	clean
+	get_correct
+	report
+#	clean
 }
 
 passes=0 

tools/selective_cfi/zest_cfi_runtime/dispatch.c

@@ -188,7 +188,7 @@ zestcfi_func_ptr_t* zest_cfi_dispatch_c(ElfW(Addr) target)
 	write_str(" -- ");
 
 	ElfW(Addr) zestcfi_addr=target;
-	int res=dl_iterate_phdr(dl_iterate_phdr_callback,(void*)&zestcfi_addr);
+	int res=zestcfi__dl_iterate_phdr(dl_iterate_phdr_callback,(void*)&zestcfi_addr);
 
 	if(res==0)
 	{