unused notice eliminate and do not set shared library prefix on MinGW

Author: Fsu0413

CMakeLists.txt

@@ -36,15 +36,14 @@ if (WIN32)
 elseif (ANDROID)
     set(RMESSENTIALS_QT5_COMPONENTS ${RMESSENTIALS_QT5_COMPONENTS} AndroidExtras)
 endif()
-find_package(Qt6 COMPONENTS ${RMESSENTIALS_QT6_COMPONENTS} OPTIONAL_COMPONENTS ZlibPrivate Core5Compat)
-find_package(Qt5 5.15 COMPONENTS ${RMESSENTIALS_QT5_COMPONENTS} OPTIONAL_COMPONENTS Zlib)
+find_package(Qt6 6.2 QUIET COMPONENTS ${RMESSENTIALS_QT6_COMPONENTS} OPTIONAL_COMPONENTS ZlibPrivate Core5Compat)
+find_package(Qt5 5.15 QUIET COMPONENTS ${RMESSENTIALS_QT5_COMPONENTS} OPTIONAL_COMPONENTS Zlib)
 
 if (NOT (Qt5_FOUND OR Qt6_FOUND))
     message(FATAL_ERROR "at least one of Qt 5 and Qt 6 is needed")
 endif()
 
 if (Qt6_FOUND)
-    message("Using Qt6")
     if (NOT Qt6Core5Compat_FOUND)
         set(RMESSENTIALS_USE_QUAZIP false)
         if (RMESSENTIALS_FORCE_USE_QUAZIP)
@@ -53,14 +52,16 @@ if (Qt6_FOUND)
     else()
     endif()
 endif()
-if (Qt5_FOUND)
-    message("Using Qt5")
-endif()
 
 if(RMESSENTIALS_USE_QUAZIP)
     set(RMESSENTIALS_QUAZIP_VERSION "1.4")
 endif()
 
+if (WIN32)
+    set(CMAKE_SHARED_LIBRARY_PREFIX "")
+    set(CMAKE_SHARED_MODULE_PREFIX "")
+endif()
+
 if (WIN32)
     get_filename_component(RMESSENTIALS_RC_IN_FILE "res/RMEssentials.rc.in" REALPATH BASE_DIR "${CMAKE_CURRENT_LIST_DIR}")
     get_filename_component(RMESSENTIALS_RC_ICON "res/RMEssentials.ico" REALPATH BASE_DIR "${CMAKE_CURRENT_LIST_DIR}")