Add linker version script to hide non-ABI stable symbols in the client
libraries. While this helps defining a more streamlined ABI, this also requires
linking a lot of additional symbols into some PA client utilities which until
now made use of the non-ABI stable symbols in libpulse. To minimize the effect
on there size a bit, strip unused symbols by linking with -ffunction-sections
-fdata-sections -Wl,--gc-sections
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@2018
fefdeb5f-60dc-0310-8127-
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