SDL: hidapi: Wrap CopyHIDDeviceInfo in define checks.

SDL Commits
1 
From a40405d724d517c2224e2a2259cccc7224c129c8 Mon Sep 17 00:00:00 2001
From: Eddy Jansson <[EMAIL REDACTED]>
Date: Wed, 20 Apr 2022 18:06:02 +0200
Subject: [PATCH] hidapi: Wrap CopyHIDDeviceInfo in define checks.

The purpose of this is to silence a 'defined but not used'
warning.
---
 src/hidapi/SDL_hidapi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/hidapi/SDL_hidapi.c b/src/hidapi/SDL_hidapi.c
index 112b07fbb3a..369b616f507 100644
--- a/src/hidapi/SDL_hidapi.c
+++ b/src/hidapi/SDL_hidapi.c
@@ -951,6 +951,7 @@ DeleteHIDDeviceWrapper(SDL_hid_device *device)
     }
 
 #if !SDL_HIDAPI_DISABLED
+#if HAVE_PLATFORM_BACKEND || HAVE_DRIVER_BACKEND || defined(SDL_LIBUSB_DYNAMIC)
 
 #define COPY_IF_EXISTS(var) \
     if (pSrc->var != NULL) { \
@@ -987,6 +988,7 @@ CopyHIDDeviceInfo(struct SDL_hid_device_info *pSrc, struct SDL_hid_device_info *
 #undef COPY_IF_EXISTS
 #undef WCOPY_IF_EXISTS
 
+#endif /* HAVE_PLATFORM_BACKEND || HAVE_DRIVER_BACKEND || SDL_LIBUSB_DYNAMIC */
 #endif /* !SDL_HIDAPI_DISABLED */
 
 static int SDL_hidapi_refcount = 0;