Looks like you need to add the library path like so: -L"E:\Libs\fmod-2.2.21-mingw-64-bit\lib\x64"
And instead of specifying the full path to fmod.dll on your command line (“E:\Libs\fmod-2.2.21-mingw-64-bit\lib\x64\fmod.dll”) you should use -lfmod instead.