meson: add gst-full-version-script option

Guillaume Desmottes requested to merge gdesmott/gst-build:version-script into master

Can be used to control the exact symbols exported, or not, in libgstreamer-full.

This is useful when building a tailored libgstreamer-full aimed to be run with some specific binaries. By using such version script one can reduce the size of the generated lib by letting the linker garbage collect all the unused APIs.

cc @xclaesse @dabrain34

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