[core] work around Windows 10 CU potentially selecting the UEFI:NTFS partition for formatting

* Should only happen with Windows 10 Creator Update (1703)
* Closes #931
* Also silence the flow of bcdboot benign errors on WinToGo creation (unless USB Debug is enabled)
* Also ensure WaitForLogical() will not actually spends 15 seconds max before giving up

src/stdio.c

@@ -294,7 +294,6 @@ const char* _StrError(DWORD error_code)
 	case ERROR_NOT_READY:
 		return lmprintf(MSG_079);
 	default:
-		uprintf("Unknown error: %08X\n", error_code);
 		SetLastError(error_code);
 		return WindowsErrorString();
 	}