Fix MinGW build issue on example (#2642)

* Fix MinGW build issue on example #2638

* Move the cmake change to example\CMakeLists.txt

* Update CMakeLists.txt on the example

Author: zEuS0390

CMakeLists.txt

@@ -176,7 +176,6 @@ if(SPDLOG_SYSTEM_INCLUDES)
     set(SPDLOG_INCLUDES_LEVEL "SYSTEM")
 endif()
 
-
 target_compile_definitions(spdlog PUBLIC SPDLOG_COMPILED_LIB)
 target_include_directories(spdlog ${SPDLOG_INCLUDES_LEVEL} PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
                                          "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")

example/CMakeLists.txt

@@ -12,7 +12,7 @@ endif()
 # Example of using pre-compiled library
 # ---------------------------------------------------------------------------------------
 add_executable(example example.cpp)
-target_link_libraries(example PRIVATE spdlog::spdlog)
+target_link_libraries(example PRIVATE spdlog::spdlog $<$<BOOL:${MINGW}>:ws2_32>)
 
 # ---------------------------------------------------------------------------------------
 # Example of using header-only library

include/spdlog/details/udp_client-windows.h

@@ -15,17 +15,19 @@
 #include <stdio.h>
 #include <string>
 
-#pragma comment(lib, "Ws2_32.lib")
-#pragma comment(lib, "Mswsock.lib")
-#pragma comment(lib, "AdvApi32.lib")
+#if defined(_MSC_VER)
+#	pragma comment(lib, "Ws2_32.lib")
+#	pragma comment(lib, "Mswsock.lib")
+#	pragma comment(lib, "AdvApi32.lib")
+#endif
 
 namespace spdlog {
 namespace details {
 class udp_client
 {
     static constexpr int TX_BUFFER_SIZE = 1024 * 10;
     SOCKET socket_ = INVALID_SOCKET;
-    sockaddr_in addr_ = {0};
+    sockaddr_in addr_ = {};
 
     static void init_winsock_()
     {