Reduce the header declarations (#1342)

- Since we have style rules to include foo.hpp at the top of its
  corresponding foo.cpp, this takes any headers included by foo.hpp
  as being also guaranteed for foo.cpp.

- Use C-style <foo.h> instead of <cfoo>, since the latter only
  guarantees putting symbols in the `std` namespace, which we are
  not using for C functions (e.g. `printf` not `std::printf`).

- Remove now-unused `__PRETTY_FUNCTION__` reporting

src/link/script.y

@@ -17,8 +17,8 @@
 	#include <array>
 	#include <assert.h>
 	#include <bit>
-	#include <cinttypes>
 	#include <fstream>
+	#include <inttypes.h>
 	#include <locale>
 	#include <stdio.h>
 	#include <string_view>