Fix dump_syms clang Windows build.

- Put FileHeaderMachineToCpuString definition in header.
- Remove extra semi-colon.

Change-Id: I726ad0f73c57908576414fd828052dff09f5c51f
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1673142
Reviewed-by: Mark Mentovai <mark@chromium.org>

src/common/windows/pe_util.cc

@@ -404,25 +404,4 @@ wstring GenerateDebugIdentifier(DWORD age, DWORD signature)
   return wstring(identifier_string);
 }
 
-constexpr const wchar_t* FileHeaderMachineToCpuString(WORD machine)
-{
-  {
-    switch (machine) {
-      case IMAGE_FILE_MACHINE_I386:
-      {
-        return L"x86";
-      }
-      case IMAGE_FILE_MACHINE_IA64:
-      case IMAGE_FILE_MACHINE_AMD64:
-      {
-        return L"x86_64";
-      }
-      default:
-      {
-        return L"unknown";
-      }
-    }
-  }
-}
-
 }  // namespace google_breakpad