add llvm package for Fedora

[leifliddy]

Fedora requires the llvm compiler in order to compile Cemu with clang.
Installing clang will install llvm-libs but not llvm.
Interestingly enough it also installs gcc and gcc-c++ as dependencies -- so we don't need to install those separately (if compiling with gcc)

========================================================================================================================================
 Package                                   Architecture          Version                                   Repository              Size
========================================================================================================================================
Installing:
 clang                                     x86_64                17.0.6-2.fc39                             updates                 76 k
Installing dependencies:
 ....
 gcc                                       x86_64                13.2.1-3.fc39                             fedora                  34 M
 gcc-c++                                   x86_64                13.2.1-3.fc39                             fedora                  13 M
 ....
 llvm-libs                                 x86_64                17.0.6-3.fc39                             updates                 27 M

[Exzap]

Thanks!