Building one tool after another reduces temporary build space required dramatically

[CodingMarkus]

Currently the script is like this:

• Download everything
• Extract everything
• Patch everything
• Build everything

Yet if you were implementing #42, there are situations were it would make sense to organize the script as follows:

• Download just the Freetype archive
• Unpack the Freetype archive
• Delete the Freetype archive
• Download the Freetype patches
• Apply the Freetype patches
• Delete the Freetype patches
• Build Freetype
• Install Freetype
• Delete the Freetype source folder

And now continue that loop again once for the other two tools.

How would that make a difference? When the script is running inside a virtual file system (VM, Docker, macOS Diskimage, etc.) these grow dynamically but they have a hard time shrinking again. Organizing the build process as suggested above results in way smaller virtual disk images in the end, as a lot less temporary space will be needed during the build process. It also makes it possible to run your scrips on machines with very little disk space available that currently would run out of space when running your script.

[chrissimpkins]

Very open to PR's to change it! Fire away.