Copy changes from the no-history fork, generated back in 2023

Original commit message:
> commit f138311d2d2e0cc9ba0496d523bb46f2c1c9fb73
> Author: rtk0c <[email protected]>
> Date:   Wed Sep 20 23:58:58 2023 -0700
>
>     Copy from the PlasticSCM repo, replace vendored glm wtih conan

In reality, this also introduced a few uncommitted changes in the
original PlasticSCM repo. See the modified and new files in this patch.

1 files changed, 0 insertions, 133 deletions

diff --git a/3rdparty/glfw/source/tests/empty.c b/3rdparty/glfw/source/tests/empty.c
deleted file mode 100644
index 72caccb..0000000
--- a/3rdparty/glfw/source/tests/empty.c
+++ /dev/null
@@ -1,133 +0,0 @@
-//========================================================================
-// Empty event test
-// Copyright (c) Camilla Löwy <[email protected]>
-//
-// This software is provided 'as-is', without any express or implied
-// warranty. In no event will the authors be held liable for any damages
-// arising from the use of this software.
-//
-// Permission is granted to anyone to use this software for any purpose,
-// including commercial applications, and to alter it and redistribute it
-// freely, subject to the following restrictions:
-//
-// 1. The origin of this software must not be misrepresented; you must not
-//    claim that you wrote the original software. If you use this software
-//    in a product, an acknowledgment in the product documentation would
-//    be appreciated but is not required.
-//
-// 2. Altered source versions must be plainly marked as such, and must not
-//    be misrepresented as being the original software.
-//
-// 3. This notice may not be removed or altered from any source
-//    distribution.
-//
-//========================================================================
-//
-// This test is intended to verify that posting of empty events works
-//
-//========================================================================
-
-#include "tinycthread.h"
-
-#define GLAD_GL_IMPLEMENTATION
-#include <glad/gl.h>
-#define GLFW_INCLUDE_NONE
-#include <GLFW/glfw3.h>
-
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-static volatile int running = GLFW_TRUE;
-
-static void error_callback(int error, const char* description)
-{
-    fprintf(stderr, "Error: %s\n", description);
-}
-
-static int thread_main(void* data)
-{
-    struct timespec time;
-
-    while (running)
-    {
-        clock_gettime(CLOCK_REALTIME, &time);
-        time.tv_sec += 1;
-        thrd_sleep(&time, NULL);
-
-        glfwPostEmptyEvent();
-    }
-
-    return 0;
-}
-
-static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
-{
-    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
-        glfwSetWindowShouldClose(window, GLFW_TRUE);
-}
-
-static float nrand(void)
-{
-    return (float) rand() / (float) RAND_MAX;
-}
-
-int main(void)
-{
-    int result;
-    thrd_t thread;
-    GLFWwindow* window;
-
-    srand((unsigned int) time(NULL));
-
-    glfwSetErrorCallback(error_callback);
-
-    if (!glfwInit())
-        exit(EXIT_FAILURE);
-
-    window = glfwCreateWindow(640, 480, "Empty Event Test", NULL, NULL);
-    if (!window)
-    {
-        glfwTerminate();
-        exit(EXIT_FAILURE);
-    }
-
-    glfwMakeContextCurrent(window);
-    gladLoadGL(glfwGetProcAddress);
-    glfwSetKeyCallback(window, key_callback);
-
-    if (thrd_create(&thread, thread_main, NULL) != thrd_success)
-    {
-        fprintf(stderr, "Failed to create secondary thread\n");
-
-        glfwTerminate();
-        exit(EXIT_FAILURE);
-    }
-
-    while (running)
-    {
-        int width, height;
-        float r = nrand(), g = nrand(), b = nrand();
-        float l = (float) sqrt(r * r + g * g + b * b);
-
-        glfwGetFramebufferSize(window, &width, &height);
-
-        glViewport(0, 0, width, height);
-        glClearColor(r / l, g / l, b / l, 1.f);
-        glClear(GL_COLOR_BUFFER_BIT);
-        glfwSwapBuffers(window);
-
-        glfwWaitEvents();
-
-        if (glfwWindowShouldClose(window))
-            running = GLFW_FALSE;
-    }
-
-    glfwHideWindow(window);
-    thrd_join(thread, &result);
-    glfwDestroyWindow(window);
-
-    glfwTerminate();
-    exit(EXIT_SUCCESS);
-}
-