feat: update flake and switch to append only backups

users/myuser/dev/0001-gdb-show-libraries-in-coredump-backtrace.patch

@@ -1,33 +0,0 @@
-diff --git a/gdb/stack.c b/gdb/stack.c
-index 7e45d59..cf38ff8 100644
---- a/gdb/stack.c
-+++ b/gdb/stack.c
-@@ -1376,7 +1376,27 @@ print_frame (const frame_print_options &fp_opts,
-     annotate_frame_function_name ();
- 
-     string_file stb;
--    gdb_puts (funname ? funname.get () : "??", &stb);
-+
-+	const char* from_where = "??";
-+	if (funname) {
-+		from_where = funname.get();
-+	} else {
-+		if (core_bfd) {
-+			gdbarch_read_core_file_mappings(gdbarch, core_bfd,
-+			[=] (ULONGEST count) { },
-+			[&] (int num, ULONGEST start, ULONGEST end, ULONGEST file_ofs,
-+			const char *filename, const bfd_build_id *build_id)
-+			{
-+				if (start <= pc && pc < end) {
-+					from_where = filename;
-+				}
-+			});
-+		} else {
-+			// too much work for this small patch. Would need to inspect /proc/<pid>/maps
-+	    }
-+	}
-+
-+    gdb_puts (from_where, &stb);
-     uiout->field_stream ("func", stb, function_name_style.style ());
-     uiout->wrap_hint (3);
-     annotate_frame_args ();

users/myuser/dev/gdb.nix

@@ -3,17 +3,9 @@
   # Also make it the default gdb.
   pwndbgWithDebuginfod =
     (pkgs.pwndbg.override {
-      gdb =
-        (pkgs.gdb.override {
-          enableDebuginfod = true;
-        })
-        .overrideAttrs (_finalAttrs: previousAttrs: {
-          patches =
-            previousAttrs.patches
-            ++ [
-              ./0001-gdb-show-libraries-in-coredump-backtrace.patch
-            ];
-        });
+      gdb = pkgs.gdb.override {
+        enableDebuginfod = true;
+      };
     })
     .overrideAttrs (_finalAttrs: previousAttrs: {
       installPhase =