remove duplicated netdb include from client handshake
remove duplicated netdb include from client handshake

Based on work from Radu Sorici <soriciradu@gmail.com>

tvanderbruggen/libwebsockets,tvanderbruggen/libwebsockets,davidgaleano/libwebsockets,davidgaleano/libwebsockets,tvanderbruggen/libwebsockets,davidgaleano/libwebsockets,tvanderbruggen/libwebsockets,tvanderbruggen/libwebsockets,davidgaleano/libwebsockets