sokol: expose the toggle_fullscreen and is_fullscreen functions (#11339)

vlib/sokol/sapp/sapp.c.v

@@ -233,3 +233,15 @@ pub fn win32_get_hwnd() voidptr {
 pub fn android_get_native_activity() voidptr {
 	return voidptr(C.sapp_android_get_native_activity())
 }
+
+// Toggle full screen
+[inline]
+pub fn toggle_fullscreen() {
+	C.sapp_toggle_fullscreen()
+}
+
+// Check if full screen rendering
+[inline]
+pub fn is_fullscreen() bool {
+	return C.sapp_is_fullscreen()
+}

vlib/sokol/sapp/sapp_funcs.c.v

@@ -103,3 +103,9 @@ fn C.sapp_win32_get_hwnd() voidptr
 
 // Android: get native activity handle
 fn C.sapp_android_get_native_activity() voidptr
+
+// Toggle full screen
+fn C.sapp_toggle_fullscreen()
+
+// Check if full screen rendering
+fn C.sapp_is_fullscreen() bool