SDL_ttf: cmake: -Wl,-undefined,error should not be used on OpenBSD

SDL Commits
1 
From 0ad0c2518be948300ed1e133741932f1ba2a4e7b Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Sat, 14 Dec 2024 21:10:59 +0100
Subject: [PATCH] cmake: -Wl,-undefined,error should not be used on OpenBSD

---
 cmake/PrivateSdlFunctions.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/PrivateSdlFunctions.cmake b/cmake/PrivateSdlFunctions.cmake
index 0bd77bb2..5fde085f 100644
--- a/cmake/PrivateSdlFunctions.cmake
+++ b/cmake/PrivateSdlFunctions.cmake
@@ -273,7 +273,7 @@ function(check_linker_support_version_script VAR)
 endfunction()
 
 function(sdl_target_link_options_no_undefined TARGET)
-    if(NOT MSVC)
+    if(NOT MSVC AND NOT CMAKE_SYSTEM_NAME MATCHES ".*OpenBSD.*")
         if(CMAKE_C_COMPILER_ID MATCHES "AppleClang")
             target_link_options(${TARGET} PRIVATE "-Wl,-undefined,error")
         else()