Merge pull request microsoft#1045 from SquallATF/mingw-fix

remove the `lib` prefix when enabling mimalloc-redirect for mingw

Author: daanx

CMakeLists.txt

@@ -594,6 +594,9 @@ if(MI_BUILD_SHARED)
     # install(FILES "$<TARGET_FILE_DIR:mimalloc>/${mi_libname}.dll.pdb" DESTINATION ${CMAKE_INSTALL_LIBDIR})
   endif()
   if(WIN32 AND MI_WIN_REDIRECT)
+    if(MINGW)
+      set_property(TARGET mimalloc PROPERTY PREFIX "")
+    endif()
     # On windows, link and copy the mimalloc redirection dll too.
     if(CMAKE_GENERATOR_PLATFORM STREQUAL "arm64ec")
       set(MIMALLOC_REDIRECT_SUFFIX "-arm64ec")