- Fix build with gcc4.2 and amd64: remove -fwritable-strings.
- Remove GNU_CONFIGURE since it was doing nothing: respect CXX CXXFLAGS.
- Clean some warnings related to deprecated C++ headers.
- Use %%DOCSDIR%% in pkg-plist
Submitted by: "Pedro F. Giffuni" <giffunip at tutopia dot com>
Approved by: Paul Marquis <pmarquis at pobox dot com> (maintainer)