upgrade harfbuzz from 0.9.28 -> 0.9.29 + fix cross compile
upgrade sqlite from 3080403 -> 3080500
gdal minimal build against master
start building gdal master + as shared lib
fix SHARED_LIBRARY_PATH env variable
revert back to old platform value, create platform_alt for android setup
also package pkg-config binary
osx build: ensure homebrew commands are on PATH
default to libgdal shared library
drop to JOBS=3 for mapnik on travis/linux
disable sandboxing/removal of any built shared libraries
Retry downloads up to 3 times.
fixup postgres build: only build libpq and then clear shared libs
make LIBRARY_PATH==SHARED_LIBRARY_PATH for now
use rpath ORIGIN for linux
copy shared libgdal into place
fix linux gdal shared copy
fix rpath origin escaping
only clear libpq shared libs
start publishing mapnik builds again