build: fix typo in configure help message
build: fix typo in configure help message

--with-qt-libdir etc, not --with-gui-libdir.
The typo was introduced in a9dbcf036bc866c2e413b1d068541e35eafdfcd0.

Crowndev/crowncoin,Infernoman/crowncoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,Infernoman/crowncoin,Crowndev/crowncoin,domob1812/crowncoin,Infernoman/crowncoin,Infernoman/crowncoin,syscoin/syscoin,syscoin/syscoin,Crowndev/crowncoin,Infernoman/crowncoin,Crowndev/crowncoin,domob1812/crowncoin,syscoin/syscoin,domob1812/crowncoin,domob1812/crowncoin,domob1812/crowncoin,syscoin/syscoin,domob1812/crowncoin,Crowndev/crowncoin,syscoin/syscoin,Infernoman/crowncoin,Crowndev/crowncoin