respect should_exit on linux as well

src/main_linux.cpp

@@ -452,7 +452,7 @@ int main(int, char**)
     init();
 
     // Main loop
-    while (!glfwWindowShouldClose(window))
+    while (!glfwWindowShouldClose(window) && !should_exit)
     {
         // Poll and handle events (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.

src/work-calendar.cpp

@@ -69,8 +69,8 @@ void init(){
     year = get_current_year();
 }
 
-static char* savefile_path = "./calendar";
-static char* wiki_url = "https://gitea.ammerhai.com/Ammerhai/work-calendar/wiki"; 
+static const char *savefile_path = "./calendar";
+static const char *wiki_url = "https://gitea.ammerhai.com/Ammerhai/work-calendar/wiki";
 
 static const char *month_names[] = {"Januar", "Februar", "März", "April", "Mai", "Juni", "Juli", "August", "September", "Oktober", "November", "Dezember"};
 
@@ -426,7 +426,7 @@ void per_frame(){
                             };
                             num_categorized_days++;
                         }
-                        color_changed:
+                        color_changed:;
                     }
 
                     ImGui::EndTable();