SDL_ttf: cmake: use copy_if_different to make a 2nd installation a no-op

SDL Commits
1 
From b288cf7fc5472c7c9ccadbcbc68dcf67437af8e9 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 22 Jul 2022 14:57:12 +0200
Subject: [PATCH] cmake: use copy_if_different to make a 2nd installation a
 no-op

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c91cdce..af29f94 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -345,7 +345,7 @@ if(SDL2TTF_INSTALL)
         # Only install a SDL2_ttf.pc file in Release mode
         install(CODE "
         # FIXME: use file(COPY_FILE) if CMake 3.21+
-        execute_process(COMMAND \"${CMAKE_COMMAND}\" -E copy \"${CMAKE_CURRENT_BINARY_DIR}/SDL2_ttf-$<CONFIG>.pc\"
+        execute_process(COMMAND \"${CMAKE_COMMAND}\" -E copy_if_different \"${CMAKE_CURRENT_BINARY_DIR}/SDL2_ttf-$<CONFIG>.pc\"
             \"${CMAKE_CURRENT_BINARY_DIR}/SDL2_ttf.pc\")
         file(INSTALL DESTINATION \"\${CMAKE_INSTALL_PREFIX}/${PC_DESTDIR}\"
             TYPE FILE