[Driver] Remove unused declaration AddStaticDeviceLibsPostLinking

The corresponding function definition was removed by:

  commit 6f96dad
  Author: Joseph Huber <jhuber6@vols.utk.edu>
  Date:   Mon Jan 23 07:13:33 2023 -0600

Author: kazutakahirata

clang/lib/Driver/ToolChains/CommonArgs.h

@@ -59,11 +59,6 @@ void AddStaticDeviceLibsLinking(Compilation &C, const Tool &T,
                                 llvm::opt::ArgStringList &CmdArgs,
                                 StringRef Arch, StringRef Target,
                                 bool isBitCodeSDL, bool postClangLink);
-void AddStaticDeviceLibsPostLinking(const Driver &D,
-                                    const llvm::opt::ArgList &DriverArgs,
-                                    llvm::opt::ArgStringList &CmdArgs,
-                                    StringRef Arch, StringRef Target,
-                                    bool isBitCodeSDL, bool postClangLink);
 void AddStaticDeviceLibs(Compilation *C, const Tool *T, const JobAction *JA,
                          const InputInfoList *Inputs, const Driver &D,
                          const llvm::opt::ArgList &DriverArgs,