Building with recent Xcode SDKs

[giuliomoro]

As I understand it, the QuickTime framework got discontinued with Xcode SDK10.12. So you have to build these projects with an older SDK.

In my fork I provide:

• SDKROOT set for each project
• a script to set SDKROOT for all projects.

giuliomoro@ed77446

if this can be of use to anyone.
Although possibly just updating the Max SDK would do?

[tap]

Are there places where Quicktime is actually used? If not, I think it should be possible to simply comment out the #include of the header.