fix lzma-support detection via xz binary

Clear() only clears a config option, not removing it and an empty
setting still exists. Hence we set the option instead to the xz path
so that the later existance check can find a binary for the test

diff --git a/apt-pkg/aptconfiguration.cc b/apt-pkg/aptconfiguration.cc
index 4f9b84e..115d116 100644 (file)
--- a/apt-pkg/aptconfiguration.cc
+++ b/apt-pkg/aptconfiguration.cc
@@ -453,7 +453,7 @@ void Configuration::setDefaultConfigurationForCompressors() {
        _config->CndSet("Dir::Bin::bzip2", "/bin/bzip2");
        _config->CndSet("Dir::Bin::xz", "/usr/bin/xz");
        if (FileExists(_config->FindFile("Dir::Bin::xz")) == true) {
-               _config->Clear("Dir::Bin::lzma");
+               _config->Set("Dir::Bin::lzma", _config->FindFile("Dir::Bin::xz"));
                _config->Set("APT::Compressor::lzma::Binary", "xz");
                if (_config->Exists("APT::Compressor::lzma::CompressArg") == false) {
                        _config->Set("APT::Compressor::lzma::CompressArg::", "--format=lzma");