Enabling cross-compilation for hbosng

[LarsGrootkarzijn]

• Added system to create tarballs for unshare sbuild in the build-all script.
• Enabled cross-compilation for ACR.

Work in progress

[LarsGrootkarzijn]

Features:

• Added menuconfig based on Linux Kernel menu, but more simplified. More convenient during development as one does not have to build all packages at once, especially useful during development cycle. Menuconfig saves the enabled features in .config, just like the Linux Kernel does. Each packages must contain info.conf, which contains the ID, name and description of the package.

Updates:

• Add cross-compilation for baseconfig.
• Refined cross compilation in build-all
• Rewrote build-all to work with the new .config file created by menuconfig

@hifiberry, please let me know what you think about the direction I am taking with this.

[hifiberry]

DO I understand this correctly that the menuconfig is to build just a subset of packages?

In this case, create a new script like "build.sh" that does this as "build-all" should build all packages.