add cryptocpp
upgrade png(1.6.10->1.6.12)/fontconfig(2.11.0->2.11.1)/pixman(0.32.4->0.32.6)
fix xz build
more minimal/explicit icu build
harfbuzz 0.9.32->0.9.34
back to 2 jobs for gcc to build mapnik
build with clang++
clang on linux fixes
use clang++ for both c++11 and c++03 builds
lto build
ranlib/ar fixes
flto workarounds
debug boost configure
boost: accept custom ar and ranlib
expand user-config.jam variables
conditionally setup lto symlinks
fix BOOST_TOOLKIT variable
cleanup to prepare for merge
fix syntax
ditch python script to build boost_python