Simplify how lists are expanded

CMakeLists.txt

@@ -105,7 +105,7 @@ if(SFML_OS_ANDROID)
     endif()
 
     # avoid missing libraries when building SFML for Android with NDK r19c and later
-    set(CMAKE_FIND_ROOT_PATH "${PROJECT_SOURCE_DIR};${CMAKE_FIND_ROOT_PATH}")
+    list(PREPEND CMAKE_FIND_ROOT_PATH "${PROJECT_SOURCE_DIR}")
 
     # make sure there's the android library available
     if (CMAKE_ANDROID_API LESS 26)

src/SFML/Main/CMakeLists.txt

@@ -4,12 +4,12 @@ set(SRCROOT ${PROJECT_SOURCE_DIR}/src/SFML/Main)
 
 # sources
 if(SFML_OS_WINDOWS)
-    set(SRC ${SRC} ${SRCROOT}/MainWin32.cpp)
+    set(SRC ${SRCROOT}/MainWin32.cpp)
 elseif(SFML_OS_IOS)
     enable_language(OBJCXX)
-    set(SRC ${SRC} ${SRCROOT}/MainiOS.mm)
+    set(SRC ${SRCROOT}/MainiOS.mm)
 elseif(SFML_OS_ANDROID)
-    set(SRC ${SRC} ${SRCROOT}/MainAndroid.cpp)
+    set(SRC ${SRCROOT}/MainAndroid.cpp)
 else()
     return()
 endif()

src/SFML/Network/CMakeLists.txt

@@ -29,14 +29,12 @@ set(SRC
 
 # add platform specific sources
 if(SFML_OS_WINDOWS)
-    set(SRC
-        ${SRC}
+    list(APPEND SRC
         ${SRCROOT}/Win32/SocketImpl.cpp
         ${SRCROOT}/Win32/SocketImpl.hpp
     )
 else()
-    set(SRC
-        ${SRC}
+    list(APPEND SRC
         ${SRCROOT}/Unix/SocketImpl.cpp
         ${SRCROOT}/Unix/SocketImpl.hpp
     )

src/SFML/System/CMakeLists.txt

@@ -50,7 +50,7 @@ else()
     )
 
     if(SFML_OS_ANDROID)
-        set(PLATFORM_SRC ${PLATFORM_SRC}
+        list(APPEND PLATFORM_SRC
             ${SRCROOT}/Android/Activity.hpp
             ${SRCROOT}/Android/Activity.cpp
             ${SRCROOT}/Android/NativeActivity.cpp