Adjusting/fixing warnings

configure.ac

libcelt/quant_bands.c

libcelt/vq.c

tests/cwrs32-test.c

tests/cwrs64-test.c

tests/ectest.c

tests/laplace-test.c

tests/mathops-test.c

tests/rotation-test.c

tests/type-test.c

tools/celtdec.c

tools/celtenc.c