SDL: Install SDL_hidapi.h

From 037030a7a2c529c183bb1666584fbc269029f22f Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 8 Nov 2021 20:26:40 -0800
Subject: [PATCH] Install SDL_hidapi.h

---
 Makefile.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile.in b/Makefile.in
index 65ccc55a06..f72ef2f4dd 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -80,6 +80,7 @@ HDRS = \
 	SDL_gamecontroller.h \
 	SDL_gesture.h \
 	SDL_haptic.h \
+	SDL_hidapi.h \
 	SDL_hints.h \
 	SDL_joystick.h \
 	SDL_keyboard.h \