Share /gnu/store in the BubbleWrap container and remove FHS mounts.

This is a Guix-specific patch not meant to be upstreamed.
diff --git a/Source/WebKit/UIProcess/Launcher/glib/BubblewrapLauncher.cpp b/Source/WebKit/UIProcess/Launcher/glib/BubblewrapLauncher.cpp
index f0a5e4b05dff..88b11f806968 100644
--- a/Source/WebKit/UIProcess/Launcher/glib/BubblewrapLauncher.cpp
+++ b/Source/WebKit/UIProcess/Launcher/glib/BubblewrapLauncher.cpp
@@ -854,27 +854,12 @@ GRefPtr<GSubprocess> bubblewrapSpawn(GSubprocessLauncher* launcher, const Proces
         "--ro-bind", "/sys/dev", "/sys/dev",
         "--ro-bind", "/sys/devices", "/sys/devices",
 
-        "--ro-bind-try", "/usr/share", "/usr/share",
-        "--ro-bind-try", "/usr/local/share", "/usr/local/share",
         "--ro-bind-try", DATADIR, DATADIR,
-
-        // We only grant access to the libdirs webkit is built with and
-        // guess system libdirs. This will always have some edge cases.
-        "--ro-bind-try", "/lib", "/lib",
-        "--ro-bind-try", "/usr/lib", "/usr/lib",
-        "--ro-bind-try", "/usr/local/lib", "/usr/local/lib",
         "--ro-bind-try", LIBDIR, LIBDIR,
-#if CPU(ADDRESS64)
-        "--ro-bind-try", "/lib64", "/lib64",
-        "--ro-bind-try", "/usr/lib64", "/usr/lib64",
-        "--ro-bind-try", "/usr/local/lib64", "/usr/local/lib64",
-#else
-        "--ro-bind-try", "/lib32", "/lib32",
-        "--ro-bind-try", "/usr/lib32", "/usr/lib32",
-        "--ro-bind-try", "/usr/local/lib32", "/usr/local/lib32",
-#endif
-
         "--ro-bind-try", PKGLIBEXECDIR, PKGLIBEXECDIR,
+
+        // Bind mount the store inside the WebKitGTK sandbox.
+        "--ro-bind", "@storedir@", "@storedir@",
     };
 
     if (launchOptions.processType == ProcessLauncher::ProcessType::DBusProxy) {
n value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=37e997bc7867901dc5eaf9060358dfddacae8dd6'>root</a>/<a href='/guix/log/gnu?id=37e997bc7867901dc5eaf9060358dfddacae8dd6'>gnu</a>/<a href='/guix/log/gnu/packages?id=37e997bc7867901dc5eaf9060358dfddacae8dd6'>packages</a>/<a href='/guix/log/gnu/packages/groovy.scm?id=37e997bc7867901dc5eaf9060358dfddacae8dd6'>groovy.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/packages/groovy.scm?id=37e997bc7867901dc5eaf9060358dfddacae8dd6&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-10-14 03:42:23 +0200'>2020-10-14</span></td><td><a href='/guix/commit/gnu/packages/groovy.scm?id=417cf5445b694331c5cc5c46112b9ac81884eebc'>gnu: groovy: Update to 3.0.5.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-07-12 23:08:15 +0200'>2020-07-12</span></td><td><a href='/guix/commit/gnu/packages/groovy.scm?id=b0e7b6992f3f845e83cfbca4d700b51dba50b4d5'>gnu: Remove ".git" from "https://github/…/….git".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>