#225 Some C++11 related fixes

[Stephan Bergmann]

Experimenting with building LibreOffice with a Clang++ that defines NULL as nullptr, stumbled over two issues in Hunspell 1.3.2 (as bundled with LibreOffice), addressed by the two patches hunspell-1.3.2-nullptr.patch and hunspell-1.3.2-literal.patch at <http://cgit.freedesktop.org/libreoffice/core/commit/?id=27b76a44593c654800cf0f90d82ccc8d5a6f1c48> "Some C++11 related fixes." Would be nice if they could be included upstream.