mpegvideo: Move QUANT_BIAS_SHIFT define to the only place it is used
fft-test: Make global exptab variable static
mpegenccontext: Remove unused dct_unquantize_h261 function pointers

Signed-off-by: Diego Biurrun <diego@biurrun.de>
fft-test: Reduce variable scope where sensibly possible

Also merge variable declaration and initialization.
fft-test: Drop unnecessary pointer indirection for context structs
disable -rpath-link on Solaris

The Solaris -rpath linker option parser is greedy.
build: add Solaris symbol versioning

The Solaris linker does not support globs in linker scripts for
symbol versioning (this is a GNU extension). Let's instead borrow
make_sunver.pl from GCC to make a description file that works
with the Solaris linker.