Everything should now compile with a C89 compiler.

libcelt/pitch.c

libcelt/quant_bands.c

libcelt/rate.c

libcelt/stack_alloc.h

libcelt/vq.c

tests/cwrs32-test.c

tests/cwrs64-test.c

tests/dft-test.c

tests/ectest.c

tests/real-fft-test.c

tests/type-test.c