Fixed error in naming of dbm and gdbm modules when compiling for Python 3.x
Fixed error in naming of dbm and gdbm modules when compiling for Python 3.x

thewtex/python-cmake-buildsystem,thewtex/python-cmake-buildsystem,adrianbroher/python-cmake-buildsystem,davidsansome/python-cmake-buildsystem,python-cmake-buildsystem/python-cmake-buildsystem