ocaml-lablgtk2.mk : extra dependency w.r.t. gtksourceview
update qt5 packages (5.2.0 final)
update package freetype
update package pcre
package sqlite: do not disable thread safety

This was disabled in 9ff1828308481a01ada21c772320f863393ea072 due to
buggy pthread support, but this this option does not induce sqlite
to use multiple threads. Instead, it builds sqlite with the
necessary mutexes to make the library thread safe.

https://sqlite.org/threadsafe.html
update package curl
update package libpng
package libltdl: add dlfcn-win32 dependency
package guile: add -ldl to LIBS
update automake version requirement
update package harfbuzz
update package opus
update package armadillo
update package xapian-core
update package cfitsio
update package fribidi
package exiv2: link to libpsapi
update package lua
package exiv2: use upstream fix for link to libpsapi
Merge pull request #287 from letouzey/master

ocaml-lablgtk2.mk : extra dependency w.r.t. gtksourceview