Remove framework gating

PortableExecutable/StringFileInfo.cs

@@ -26,11 +26,7 @@
         /// <summary>
         /// The Unicode string L"StringFileInfo".
         /// </summary>
-#if NET48
-        public string Key { get; set; }
-#else
         public string? Key { get; set; }
-#endif
 
         /// <summary>
         /// As many zero words as necessary to align the Children member on a 32-bit boundary.
@@ -42,10 +38,6 @@
         /// member indicates the appropriate language and code page for displaying the text in
         /// that StringTable structure.
         /// </summary>
-#if NET48
-        public StringTable[] Children { get; set; }
-#else
         public StringTable?[]? Children { get; set; }
-#endif
     }
 }