vcl: don't throw misleading exceptions on every failed access

During the build different instances of gengal will create a temp file
called "instdir/share/config/cdefghij.klm", and enumerate the
directories in instdir/share/config; it may happen that the enumeration
sees the temp file, and it is removed before fetchFileStatus is called,
resulting in E_NOENT rc and the exception.

The FileIsValidIconTheme() should be able to handle most errors here.

(regression from 60954a8a)

Change-Id: Id9361a37b8569d01509efcc8cda2bc17e9eabcd8

vcl/source/app/IconThemeScanner.cxx

@@ -44,7 +44,10 @@ OUString convert_to_absolute_path(const OUString& path)
     osl::FileBase::RC rc = resolver.fetchFileStatus(path);
     if (rc != osl::FileBase::E_None) {
         SAL_WARN("vcl.app", "Could not resolve path '" << path << "' to search for icon themes.");
-        throw std::runtime_error("Provided a recursive symlink to a icon theme directory that could not be resolved.");
+        if (rc == osl::FileBase::E_MULTIHOP)
+        {
+            throw std::runtime_error("Provided a recursive symlink to a icon theme directory that could not be resolved.");
+        }
     }
     return resolver.m_aStatus.getFileURL();
 }