Drop an unused variable that escaped the debugging code cleanup, and save two
cycles in the block qi decode that no one even uses yet.

It appears Solaris's cc is ignoring the signedness of bitfield types.
Add explicit casts as a work-around.

Rename the bitpacker source files imported from libogg to avoid
confusing simple build systems using both libraries.

Remove all TH_DEBUG statements.
They required variadic macros, which are not standard in C90.
They also cluttered up the code, and were unlikely to be maintained properly
anyway.
Also, remove all the tabs and trailing whitespace, etc., that xiphmont gunked
up my code with.

Check for an uninitialized state before dereferencing in propagating
decode calls. Annodex ticket 409.

Correct an introduced bug that cam in the with the new loop filter asm;

My testing was flawed and there were several bounds errors in the new
code written to reconcile the new ASM's expected data ordering.

add export symbols flag for mingw build fixes #1383