srt-to-vtt-cl: fix macOS builds

The upstream Makefile is using logic to build into different dirs
depending on uname output. Trivial to get macOS builds working if
we just don't do that.

I've also stripped out a use of substituteAll that was having no
effect (the variables it replaced were removed during review of
the initial PR.)

pkgs/tools/cd-dvd/srt-to-vtt-cl/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, substituteAll }:
+{ lib, stdenv, fetchFromGitHub }:
 
 stdenv.mkDerivation rec {
   pname = "srt-to-vtt-cl";
@@ -12,14 +12,13 @@ stdenv.mkDerivation rec {
   };
 
   patches = [
-    (substituteAll {
-      src = ./fix-validation.patch;
-    })
+    ./fix-validation.patch
+    ./simplify-macOS-builds.patch
   ];
 
   installPhase = ''
     mkdir -p $out/bin
-    cp bin/$(uname -s)/$(uname -m)/srt-vtt $out/bin
+    cp bin/srt-vtt $out/bin
   '';
 
   meta = with lib; {
@@ -27,6 +26,6 @@ stdenv.mkDerivation rec {
     license = licenses.mit;
     maintainers = with maintainers; [ ericdallo ];
     homepage = "https://github.com/nwoltman/srt-to-vtt-cl";
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }

pkgs/tools/cd-dvd/srt-to-vtt-cl/simplify-macOS-builds.patch

@@ -0,0 +1,31 @@
+From be08356f421825d3d2dd7ab687f86d9981a31f9a Mon Sep 17 00:00:00 2001
+From: "Travis A. Everett" <travis.a.everett@gmail.com>
+Date: Thu, 3 Aug 2023 20:15:40 -0500
+Subject: [PATCH] simplify macOS builds
+
+---
+ Makefile | 8 +-------
+ 1 file changed, 1 insertion(+), 7 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index 6dfd829..19c3ae3 100644
+--- a/Makefile
++++ b/Makefile
+@@ -8,13 +8,7 @@ CXXFLAGS = -std=c++11 -O2 -MMD -I ./deps
+ OBJECTS := src/text_encoding_detect.o src/Utils.o src/Converter.o src/main.o
+ DEPENDS := $(OBJECTS:.o=.d)
+ EXEC = srt-vtt
+-UNAME_S := $(shell uname -s)
+-ifeq ($(UNAME_S), Darwin)
+-	BIN_DIR = bin/Mac-OSX
+-else
+-	UNAME_M := $(shell uname -m)
+-	BIN_DIR = bin/$(UNAME_S)/$(UNAME_M)
+-endif
++BIN_DIR = bin
+ EXEC_PATH = $(BIN_DIR)/$(EXEC)
+ 
+ .PHONY: test
+-- 
+2.39.0
+