Simplify GUI settings and build flags

cmd/vrc_osc_gui/main.go

@@ -3,12 +3,22 @@
 package main
 
 import (
+	"os"
 	"log"
+	"path/filepath"
 
 	"vrc_osc_go/internal/app"
 )
 
 func main() {
-	_ = app.AppendRuntimeLog("GUI", "starting vrc_osc_gui.exe")
-	log.Fatal(runNativeGUI())
+	if exe, err := os.Executable(); err == nil {
+		_ = app.AppendRuntimeLog("GUI", "starting vrc_osc_gui.exe exe="+exe+" dir="+filepath.Dir(exe))
+	} else {
+		_ = app.AppendRuntimeLog("GUI", "starting vrc_osc_gui.exe exe=unknown err="+err.Error())
+	}
+	if err := runNativeGUI(); err != nil {
+		_ = app.AppendRuntimeLog("GUI", "runNativeGUI failed: "+err.Error())
+		log.Fatal(err)
+	}
+	_ = app.AppendRuntimeLog("GUI", "runNativeGUI returned cleanly")
 }