sdl12-compat: cmake: fix SDLMain.m filename case.

From 875e6b58b1911b48303b2831ba2d34c46f4880c2 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Fri, 9 Jul 2021 11:55:10 +0300
Subject: [PATCH] cmake: fix SDLMain.m filename case.

---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7a5db29..905e5c5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -125,7 +125,7 @@ endif()
 
 # SDLmain library...
 if(APPLE)
-    add_library(SDLmain STATIC src/SDLmain/macosx/SDLmain.m)
+    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.