kitty: replace library path using patch instead of substituteInPlace

This makes patching the path for `libEGL` consistent with `libstartup-notification` and `libcanberra`.
It should also prevent silently doing nothing in case the code in kitty is changed, similar to what was described in 1842c4aaa4.

pkgs/applications/misc/kitty/default.nix

@@ -70,6 +70,7 @@ buildPythonApplication rec {
       src = ./library-paths.patch;
       libstartup_notification = "${libstartup_notification}/lib/libstartup-notification-1.so";
       libcanberra = "${libcanberra}/lib/libcanberra.so";
+      libEGL = "${stdenv.lib.getLib libGL}/lib/libEGL.so.1";
     })
   ] ++ stdenv.lib.optionals stdenv.isDarwin [
     ./no-lto.patch
@@ -77,10 +78,6 @@ buildPythonApplication rec {
     ./png2icns.patch
   ];
 
-  preConfigure  = stdenv.lib.optional (!stdenv.isDarwin) ''
-    substituteInPlace glfw/egl_context.c --replace "libEGL.so.1" "${stdenv.lib.getLib libGL}/lib/libEGL.so.1"
-  '';
-
   buildPhase = if stdenv.isDarwin then ''
     ${python.interpreter} setup.py kitty.app --update-check-interval=0
   '' else ''

pkgs/applications/misc/kitty/library-paths.patch

@@ -1,3 +1,15 @@
+--- a/glfw/egl_context.c
++++ b/glfw/egl_context.c
+@@ -314,7 +314,7 @@ bool _glfwInitEGL(void)
+ #elif defined(__CYGWIN__)
+         "libEGL-1.so",
+ #else
+-        "libEGL.so.1",
++        "@libEGL@",
+ #endif
+         NULL
+     };
+
 --- a/kitty/desktop.c
 +++ b/kitty/desktop.c
 @@ -30,7 +30,7 @@