Define NDEBUG to disable debug output

Bug-Debian: https://bugs.debian.org/822727
Bug-Ubuntu: https://launchpad.net/bugs/1649224

Cherry-pick defining NDEBUG from upstream commit
5fa7eeb9a3df65452970566abc027db566012caf to disable debug output

Gbp-Pq: Name ndebug.patch

libsoxr (0.1.2-3) unstable; urgency=medium

  * Team upload.
  * Fix FTCBFS:  Closes: #853194
    + Feed endianness from DEB_HOST_ARCH_ENDIAN.
    + Honour DEB_BUILD_OPTIONS=nocheck.
    Thanks to Helmut Grohne <helmut@subdivi.de> for the patch.
  * Bump debhelper compat level to 10.
    + Drop --parallel, now default.
  * Bump Standards-Version to 4.1.1, no changes needed.
  * Drop explicit Testsuite field, not needed anymore.

[dgit import unpatched libsoxr 0.1.2-3]

Import libsoxr_0.1.2-3.debian.tar.xz

[dgit import tarball libsoxr 0.1.2-3 libsoxr_0.1.2-3.debian.tar.xz]

Import libsoxr_0.1.2.orig.tar.xz

[dgit import orig libsoxr_0.1.2.orig.tar.xz]