all: clean up code, upgrade to modern Go

Signed-off-by: ddkwork

internal/egl/egl.go

@@ -9,6 +9,7 @@ import (
 	"errors"
 	"fmt"
 	"runtime"
+	"slices"
 	"strings"
 
 	"gioui.org/gpu"
@@ -154,12 +155,7 @@ func (c *Context) EnableVSync(enable bool) {
 }
 
 func hasExtension(exts []string, ext string) bool {
-	for _, e := range exts {
-		if ext == e {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(exts, ext)
 }
 
 func createContext(disp _EGLDisplay) (*eglContext, error) {

internal/egl/egl_windows.go

@@ -186,6 +186,6 @@ func eglWaitClient() bool {
 
 // issue34474KeepAlive calls runtime.KeepAlive as a
 // workaround for golang.org/issue/34474.
-func issue34474KeepAlive(v interface{}) {
+func issue34474KeepAlive(v any) {
 	runtime.KeepAlive(v)
 }