Complete adding of GNU sort

Mention GNU Coreutils in the requirements section and check that
$(SORT) is available.
Add hints to update same-source pkgs in lockstep

Add comments to the version lines of packages binutils, gcc, gmp and
mpfr to remind people updating them of updating the version of certain
other packages as well that use the same source download.
Merge pull request #171 from uklauer/ch

GNU sort, same-source packages
update package sqlite
Use the canonical URL for GNU gettext
Fix HTML in index.html
Rename patch file to follow conventions
package liblqr-1: add cflags for static build to pkg-config file
Merge branch 'master' of github.com:mxe/mxe
package imagemagick: add liblqr-1 dependency
package liblqr-1: add patch reference
update package matio
update package xapian-core