fix my wrong changes: install spdlog target too

CMakeLists.txt

@@ -170,7 +170,7 @@ if(SPDLOG_INSTALL)
     # Include files
     #---------------------------------------------------------------------------------------
     install(DIRECTORY include/ DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
-    install(TARGETS spdlog_header_only EXPORT spdlog DESTINATION "${CMAKE_INSTALL_LIBDIR}/spdlog")
+    install(TARGETS spdlog spdlog_header_only EXPORT spdlog DESTINATION "${CMAKE_INSTALL_LIBDIR}/spdlog")
 
     #---------------------------------------------------------------------------------------
     # Package and version files

example/CMakeLists.txt

@@ -4,7 +4,7 @@
 cmake_minimum_required(VERSION 3.13)
 project(spdlog_examples CXX)
 
-if(NOT TARGET spdlog_header_only)
+if(NOT TARGET spdlog)
     # Stand-alone build
     find_package(spdlog REQUIRED)
 endif()