store log file in ~/.config/voidsw/

Index: source/sw/src/game.cpp
--- source/sw/src/game.cpp.orig
+++ source/sw/src/game.cpp
@@ -3393,6 +3393,9 @@ void CommandLineHelp(char const * const * argv)
 
 int32_t app_main(int32_t argc, char const * const * argv)
 {
+    char logpath[BMAX_PATH];
+    char *homedir;
+    int r;
     int i;
     extern int MovesPerPacket;
     void DoSector(void);
@@ -3457,21 +3460,22 @@ int32_t app_main(int32_t argc, char const * const * ar
     }
 #endif
 
-#ifdef __APPLE__
-    if (!g_useCwd)
+    homedir = Bgethomedir();
+    if (!g_useCwd && homedir != NULL)
     {
-        char cwd[BMAX_PATH];
-        char *homedir = Bgethomedir();
-        if (homedir)
-            Bsnprintf(cwd, sizeof(cwd), "%s/Library/Logs/" APPBASENAME ".log", homedir);
+        Bsnprintf(logpath, sizeof(logpath), "%s/.config/%s", homedir, APPBASENAME);
+        r = Bmkdir(logpath, S_IRWXU);
+        if (r == 0 || (r == -1 && errno == EEXIST))
+        {
+            Bsnprintf(logpath, sizeof(logpath), "%s/.config/%s/%s.log", homedir, APPBASENAME, APPBASENAME);
+            OSD_SetLogFile(logpath);
+        }
         else
-            Bstrcpy(cwd, APPBASENAME ".log");
-        OSD_SetLogFile(cwd);
-        Xfree(homedir);
+            OSD_SetLogFile(APPBASENAME ".log");
     }
     else
-#endif
-    OSD_SetLogFile(APPBASENAME ".log");
+        OSD_SetLogFile(APPBASENAME ".log");
+    Bfree(homedir);
 
     wm_setapptitle(APPNAME);