fix purego build errors on non-supported architectures

agent/gpu_nvml.go

@@ -1,3 +1,5 @@
+//go:build (linux || windows) && (amd64 || arm64)
+
 package agent
 
 import (

agent/gpu_nvml_linux.go

@@ -1,14 +1,14 @@
-//go:build linux
+//go:build linux && (amd64 || arm64)
 
 package agent
 
 import (
+	"log/slog"
 	"os"
 	"path/filepath"
 	"strings"
 
 	"github.com/ebitengine/purego"
-	"log/slog"
 )
 
 func openLibrary(name string) (uintptr, error) {

agent/gpu_nvml_unsupported.go

@@ -1,9 +1,21 @@
-//go:build !linux && !windows
+//go:build (!linux && !windows) || (!amd64 && !arm64)
 
 package agent
 
 import "fmt"
 
+type nvmlCollector struct {
+	gm *GPUManager
+}
+
+func (c *nvmlCollector) init() error {
+	return fmt.Errorf("nvml not supported on this platform")
+}
+
+func (c *nvmlCollector) start() {}
+
+func (c *nvmlCollector) collect() {}
+
 func openLibrary(name string) (uintptr, error) {
 	return 0, fmt.Errorf("nvml not supported on this platform")
 }

agent/gpu_nvml_windows.go

@@ -1,4 +1,4 @@
-//go:build windows
+//go:build windows && (amd64 || arm64)
 
 package agent