Adjust to newer Boost interface.

--- a/src/rgw/rgw_asio_client.cc	1970-01-01 01:00:01.000000000 +0100
+++ b/src/rgw/rgw_asio_client.cc	2024-09-11 08:33:21.723548804 +0200
@@ -39,11 +39,11 @@
     const auto& value = header->value();
 
     if (field == beast::http::field::content_length) {
-      env.set("CONTENT_LENGTH", value.to_string());
+      env.set("CONTENT_LENGTH", std::string(value));
       continue;
     }
     if (field == beast::http::field::content_type) {
-      env.set("CONTENT_TYPE", value.to_string());
+      env.set("CONTENT_TYPE", std::string(value));
       continue;
     }
 
@@ -62,26 +62,26 @@
     }
     *dest = '\0';
 
-    env.set(buf, value.to_string());
+    env.set(buf, std::string(value));
   }
 
   int major = request.version() / 10;
   int minor = request.version() % 10;
   env.set("HTTP_VERSION", std::to_string(major) + '.' + std::to_string(minor));
 
-  env.set("REQUEST_METHOD", request.method_string().to_string());
+  env.set("REQUEST_METHOD", std::string(request.method_string()));
 
   // split uri from query
   auto uri = request.target();
   auto pos = uri.find('?');
   if (pos != uri.npos) {
     auto query = uri.substr(pos + 1);
-    env.set("QUERY_STRING", query.to_string());
+    env.set("QUERY_STRING", std::string(query));
     uri = uri.substr(0, pos);
   }
-  env.set("SCRIPT_URI", uri.to_string());
+  env.set("SCRIPT_URI", std::string(uri));
 
-  env.set("REQUEST_URI", request.target().to_string());
+  env.set("REQUEST_URI", std::string(request.target()));
 
   char port_buf[16];
   snprintf(port_buf, sizeof(port_buf), "%d", local_endpoint.port());
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<div class='path'>path: <a href='/guix/log/?id=9076b06846ca8bf2aec797086d8b2ed4ae2f2689'>root</a>/<a href='/guix/log/gnu?id=9076b06846ca8bf2aec797086d8b2ed4ae2f2689'>gnu</a>/<a href='/guix/log/gnu/installer.scm?id=9076b06846ca8bf2aec797086d8b2ed4ae2f2689'>installer.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/installer.scm?id=9076b06846ca8bf2aec797086d8b2ed4ae2f2689&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-09-23 18:17:18 +0200'>2021-09-23</span></td><td><a href='/guix/commit/gnu/installer.scm?id=f34b8087411cffb0a572c0ecdce92084f0593fd4'>installer: Support XFS.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/newt/partition.scm (run-fs-type-page): Add ‘xfs’ to the
list box.
* gnu/installer/parted.scm (user-fs-type-name, user-fs-type-&gt;mount-type)
(partition-filesystem-user-type): Add ‘xfs’ mapping.
(create-xfs-file-system): New procedure.
(format-user-partitions): Use it.
* gnu/installer.scm (set-installer-path): Add xfsprogs.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>