SDL: minor adjustment to os/2 watcom makefile

From 2823534fef9b3e1a8388adb3f6fa147c2ec2203a Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Thu, 7 Apr 2022 20:11:50 +0300
Subject: [PATCH] minor adjustment to os/2 watcom makefile

---
 Makefile.os2 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile.os2 b/Makefile.os2
index 328215679df..073ae5bc226 100644
--- a/Makefile.os2
+++ b/Makefile.os2
@@ -140,9 +140,11 @@ SDL_blendpoint.obj: SDL_blendpoint.c
     wcc386 $(CFLAGS_DLL) -wcd=200 -fo=$^@ $<
 SDL_RLEaccel.obj: SDL_RLEaccel.c
     wcc386 $(CFLAGS_DLL) -wcd=201 -fo=$^@ $<
+!ifeq HIDAPI 1
 # c99 mode needed because of structs with flexible array members in libusb.h
 SDL_hidapi.obj: SDL_hidapi.c
     wcc386 $(CFLAGS_DLL) -za99 -fo=$^@ $<
+!endif
 
 $(LIBICONV_LIB):  "src/core/os2/iconv2.lbc"
     @echo * Creating: $@