SDL_shadercross: Fix args counting during gathering of args for DXC compiler

SDL Commits
1 
From c2ba7d10699965218d638b0977c5c61b4441f521 Mon Sep 17 00:00:00 2001
From: minchopaskal <[EMAIL REDACTED]>
Date: Mon, 24 Feb 2025 17:24:17 +0200
Subject: [PATCH] Fix args counting during gathering of args for DXC compiler

---
 src/SDL_shadercross.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/SDL_shadercross.c b/src/SDL_shadercross.c
index 676883b..e0fd1bd 100644
--- a/src/SDL_shadercross.c
+++ b/src/SDL_shadercross.c
@@ -418,9 +418,8 @@ static void *SDL_ShaderCross_INTERNAL_CompileUsingDXC(
             SDL_free(entryPointUtf16);
             return NULL;
         }
-        args[2] = (LPCWSTR)L"-I";
-        args[3] = includeDirUtf16;
-        argCount += 2;
+        args[argCount++] = (LPCWSTR)L"-I";
+        args[argCount++] = includeDirUtf16;
     }
 
     source.Ptr = info->source;