use the linker to link generate_uudmap$(EXE)

use the linker to link generate_uudmap$(EXE)

Recent versions of clang++ complain when building .c files as
C++:

  clang-16: warning: treating 'c' input as 'c++' when in C++ mode,
  this behavior is deprecated [-Wdeprecated]

The solution for this would be to Configure with:

  ./Configure ... -Dcc=clang++\ -xc++ -Dld=clang++

this results in the link stage for generate_uudmap trying to compile
generate_uudmap.o as C++ and hilarity ensues.

Fix this by using the linker to link.