bpo-41054: Simplify resource compilation on Windows (GH-21004)


Remove auto-generated resource header. Pass definitions required
by resource files (ORIGINAL_FILENAME and FIELD3) directly to resource
compiler.

Remove unused MS_DLL_ID resource string and related dead code.
(cherry picked from commit 4efc3360c9a83d5891f27ed67b4f0ab7275d2ab4)

Co-authored-by: Nikita Nemkin <nikita@nemkin.ru>
diff --git a/PC/dl_nt.c b/PC/dl_nt.c
index 0bf04f1..7f17ee1 100644
--- a/PC/dl_nt.c
+++ b/PC/dl_nt.c
@@ -12,16 +12,10 @@
 #include "windows.h"
 
 #ifdef Py_ENABLE_SHARED
-#ifdef MS_DLL_ID
-// The string is available at build, so fill the buffer immediately
-char dllVersionBuffer[16] = MS_DLL_ID;
-#else
-char dllVersionBuffer[16] = ""; // a private buffer
-#endif
 
 // Python Globals
 HMODULE PyWin_DLLhModule = NULL;
-const char *PyWin_DLLVersionString = dllVersionBuffer;
+const char *PyWin_DLLVersionString = MS_DLL_ID;
 
 BOOL    WINAPI  DllMain (HANDLE hInst,
                                                 ULONG ul_reason_for_call,
@@ -31,11 +25,6 @@
     {
         case DLL_PROCESS_ATTACH:
             PyWin_DLLhModule = hInst;
-#ifndef MS_DLL_ID
-            // If we have MS_DLL_ID, we don't need to load the string.
-            // 1000 is a magic number I picked out of the air.  Could do with a #define, I spose...
-            LoadString(hInst, 1000, dllVersionBuffer, sizeof(dllVersionBuffer));
-#endif
             break;
 
         case DLL_PROCESS_DETACH: