Update package freetype

Update freetype to 2.5.0.1 (fix for a packaging error): "No code
changes. However, CFF_CONFIG_OPTION_OLD_ENGINE was accidentally
enabled."

Also update the website URL.
Merge pull request #210 from uklauer/freetype

Update package freetype
package freetype: use pkg-config for libpng and set extra libs for config files
package freetype: use version variable for url
package glew: fix update macro