enable modern CMake CRT handling

Author: kzhdev

CHANGELOG

@@ -5,6 +5,7 @@
 - Install CMake config files to lib/cmake/slick-socket/
 - Export library targets with proper install commands
 - Enable downstream projects to use find_package(slick-socket)
+- Enable modern CMake CRT handling. Only sets a default if the user/toolchain hasn't already specified it
 
 #v1.0.4 - [01/12/2026]
 - Rename repository from slick_socket to slick-socket (hyphenated naming follows recommended convention)

CMakeLists.txt

@@ -11,7 +11,13 @@ project(slick-socket
 
 # MSVC configuration
 if(MSVC)
-  set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
+  # Enable policy CMP0091 to allow CMAKE_MSVC_RUNTIME_LIBRARY to be controlled by toolchain/user
+  cmake_policy(SET CMP0091 NEW)
+  
+  # Only set default if not already specified by user or toolchain (e.g., vcpkg)
+  if(NOT DEFINED CMAKE_MSVC_RUNTIME_LIBRARY)
+    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
+  endif()
 endif()
 
 if (NOT CMAKE_BUILD_TYPE)