comms/flrig: Forgot to remove patch

- patch-src_main.cxx is no longer necessary.

comms/flrig/files/patch-src_main.cxx

@@ -1,23 +0,0 @@
-- fix build on 14 with clang-16 because std::ostringstream::streampos
-- doesn't exist there.
-- using the C++ standard std::streampos instead.
-
---- src/main.cxx.orig	2023-07-16 15:55:45 UTC
-+++ src/main.cxx
-@@ -21,6 +21,7 @@
- #include "config.h"
- 
- #include <stdlib.h>
-+#include <ios>
- #include <iostream>
- #include <fstream>
- #include <sstream>
-@@ -313,7 +314,7 @@ void rotate_log(std::string filename)
- {
- 	const int n = 5; // rename existing log files to keep up to 5 old versions
- 	ostringstream oldfn, newfn;
--	ostringstream::streampos p;
-+	streampos p;
- 
- 	oldfn << filename << '.';
- 	newfn << filename << '.';