SDL: cmake: do list(APPEND SDLMAIN_SOURCES)

SDL Commits
1 
From c61367c2731dca1e7ea0e881f69d96317c0aaaab Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Thu, 16 Jun 2022 04:14:52 +0200
Subject: [PATCH] cmake: do list(APPEND SDLMAIN_SOURCES)

---
 CMakeLists.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1194ecc1cbc..9d9dc1a3ccb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1096,7 +1096,7 @@ if(ANDROID)
   endif()
 
   file(GLOB ANDROID_MAIN_SOURCES ${SDL2_SOURCE_DIR}/src/main/android/*.c)
-  set(SDLMAIN_SOURCES ${SDLMAIN_SOURCES} ${ANDROID_MAIN_SOURCES})
+  list(APPEND SDLMAIN_SOURCES ${ANDROID_MAIN_SOURCES})
 
   if(SDL_AUDIO)
     set(SDL_AUDIO_DRIVER_ANDROID 1)
@@ -2462,7 +2462,7 @@ elseif(VITA)
 
 elseif(PSP)
  file(GLOB PSP_MAIN_SOURCES ${SDL2_SOURCE_DIR}/src/main/psp/*.c)
- set(SDLMAIN_SOURCES ${SDLMAIN_SOURCES} ${PSP_MAIN_SOURCES})
+ list(APPEND SDLMAIN_SOURCES ${PSP_MAIN_SOURCES})
 
   if(SDL_AUDIO)
     set(SDL_AUDIO_DRIVER_PSP 1)