Remove build option for installing the header files.
Rename the other options: INSTALL_PLASMOID -> SMB4K_INSTALL_PLASMOID WITH_WS_DISCOVERY -> SMB4K_WITH-WS-DISCOVERY
Rename the other options: INSTALL_PLASMOID -> SMB4K_INSTALL_PLASMOID WITH_WS_DISCOVERY -> SMB4K_WITH-WS-DISCOVERY