new package: plibc
add package ocaml-flexdll
add package ocaml-core
Explanation for adding packages to index.html
added armadillo 3.4.0 with test
update package lcms
update package postgresql
update package libxslt
upgrade package exiv2
Merge branch 'stable'
fix suitesparse checksum
add tertiary fallback for unavailable package files
fix bracketing of wget calls
cleanup after failed download
add package cdn fallback
update package qt
package qt: use new unified mkspec for cross building

The regular win32-g++* mkspecs now support cross bulding. No need
to use unsupported/win32-g++-cross anymore.
package gcc: fix for OSX ASLR issues with pre-compiled headers
package openal: disable examples build
package portaudio: fix detection of $(TARGET)-ar