- Updated DUMB to revision 4e0faec2b81698376b78c4715d633de23140cd10

    - renamed "restrict" parameters to "restrict_"

    - "restrict" is a keyword since C99

Actually it was already implemented, but with a different variable name. Anyways, it was not possible to apply the previous revisions, some because of FIR resampler, some because of the Lanczos resampler (introduced in 1eef4c9f892c119f2f92f0d928efe1b7a98af934) and some because of the surround mixer (introduced in b40d6a5877558121d876ee3c578daecf138b504c , not hard to merge but should be adapted to the custom code).