Add boost files to sources. Fixes make distcheck when boost headers are not installed.
Add boost files to sources. Fixes make distcheck when boost headers are not installed.

EasyRPG/liblcf,Zegeri/liblcf,glynnc/liblcf,Ghabry/easyrpg-liblcf,glynnc/liblcf,glynnc/liblcf,Zegeri/liblcf,carstene1ns/easyrpg-liblcf,EasyRPG/liblcf,EasyRPG/liblcf,Zegeri/liblcf,fdelapena/easyrpg-liblcf,carstene1ns/easyrpg-liblcf,Ghabry/easyrpg-liblcf,Ghabry/easyrpg-liblcf,carstene1ns/easyrpg-liblcf,glynnc/liblcf,EasyRPG/liblcf,fdelapena/easyrpg-liblcf,Ghabry/easyrpg-liblcf,fdelapena/easyrpg-liblcf