sdl12-compat: Fixed typo in cmake script for win32 SDLmain compile definitions.

From 271273c6ee03ae8c32f98827abbc530fc08af9ae Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 28 Jun 2021 15:55:40 +0300
Subject: [PATCH] Fixed typo in cmake script for win32 SDLmain compile
 definitions.

Fixes: https://github.com/libsdl-org/sdl12-compat/issues/117
---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 14c252a..ed4ba01 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -110,7 +110,7 @@ if(APPLE)
     add_library(SDLmain STATIC src/SDLmain/macosx/SDLmain.m)
 elseif(WIN32)
     add_library(SDLmain STATIC src/SDLmain/win32/SDL_win32_main.c)
-    set_target_properties(SDLmain PROPERTIES COMPILE_DEFINITIONS "$_CRT_SECURE_NO_WARNINGS;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE")  # !!! FIXME: don't use C runtime? We fixed this in SDL2.
+    set_target_properties(SDLmain PROPERTIES COMPILE_DEFINITIONS "_CRT_SECURE_NO_WARNINGS;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE")  # !!! FIXME: don't use C runtime? We fixed this in SDL2.
 else()
     add_library(SDLmain STATIC src/SDLmain/dummy/SDL_dummy_main.c)
 endif()