disabled alternative uncompressed URIs

When a compressed file: URI is requested, it checks to see if the
uncompressed file exsits, and uses that instead.  This isn't always
desireable, since e.g. zstd(1) is known for its very fast uncompression
which can be performed even as you read a file, but uncompressing the
whole file can eat up too much virtual memory.

apt/apt-pkg/acquire-item.cc

@@ -441,6 +441,7 @@ void pkgAcqIndex::Done(string Message,unsigned long Size,string MD5,
    Erase = false;
    Complete = true;
 
+#if 0
    // Handle the unzipd case
    string FileName = LookupTag(Message,"Alt-Filename");
    if (FileName.empty() == false)
@@ -457,8 +458,9 @@ void pkgAcqIndex::Done(string Message,unsigned long Size,string MD5,
       Mode = "copy";
       return;
    }
+#endif
 
-   FileName = LookupTag(Message,"Filename");
+   string FileName = LookupTag(Message,"Filename");
    if (FileName.empty() == true)
    {
       Status = StatError;

apt/apt-pkg/acquire-method.cc

@@ -201,6 +201,7 @@ void pkgAcqMethod::URIDone(FetchResult &Res, FetchResult *Alt)
 
    if (Alt != 0)
    {
+#if 0
       if (Alt->Filename.empty() == false)
 	 s << "Alt-Filename: " << Alt->Filename << "\n";
 
@@ -217,6 +218,7 @@ void pkgAcqMethod::URIDone(FetchResult &Res, FetchResult *Alt)
 
       if (Alt->IMSHit == true)
 	 s << "Alt-IMS-Hit: true\n";
+#endif
    }
 
    s << "\n";

apt/methods/file.cc

@@ -58,6 +58,7 @@ bool FileMethod::Fetch(FetchItem *Itm)
 	 Res.IMSHit = true;
    }
 
+#if 0
    // CNC:2003-11-04
    // See if we can compute a file without a .gz/.bz2/etc extension
    string ComprExtension = _config->Find("Acquire::ComprExtension", ".xz");
@@ -79,6 +80,7 @@ bool FileMethod::Fetch(FetchItem *Itm)
 	 return true;
       }      
    }
+#endif
 
    if (Res.Filename.empty() == true)
       return _error->Error(_("File not found"));