SDL: add missing quotes to the fallback CHECK_OBJC_SOURCE_COMPILES macro

From 6ba5f08e5d3cd2b70fd6469c16b2cbbc35a86a40 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Wed, 21 Sep 2022 10:37:02 +0300
Subject: [PATCH] add missing quotes to the fallback CHECK_OBJC_SOURCE_COMPILES
 macro

Closes:  https://github.com/libsdl-org/SDL/issues/6268 .
(cherry picked from commit 098a7a043ebe24d158ce21eb015118ba14f15347)
---
 cmake/macros.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/macros.cmake b/cmake/macros.cmake
index 920785bad39..267a8afb127 100644
--- a/cmake/macros.cmake
+++ b/cmake/macros.cmake
@@ -96,7 +96,7 @@ if(${CMAKE_VERSION} VERSION_LESS "3.16.0")
   macro(CHECK_OBJC_SOURCE_COMPILES SOURCE VAR)
     set(PREV_REQUIRED_DEFS "${CMAKE_REQUIRED_DEFINITIONS}")
     set(CMAKE_REQUIRED_DEFINITIONS "-x objective-c ${PREV_REQUIRED_DEFS}")
-    CHECK_C_SOURCE_COMPILES(${SOURCE} ${VAR})
+    CHECK_C_SOURCE_COMPILES("${SOURCE}" ${VAR})
     set(CMAKE_REQUIRED_DEFINITIONS "${PREV_REQUIRED_DEFS}")
   endmacro()
 else()