added to signal repo

On a recent Octave 10 (dev), compilation fails:

g++ -std=gnu++17 -c  -fPIC -I/usr/local/include/octave-10.0.0/octave/.. -I/usr/local/include/octave-10.0.0/octave -I/usr/local/include  -pthread -fopenmp -ggdb3 -O2 -march=native -mtune=native -mavx -mavx2 -flto=auto  -Wall   upfirdn.cc -o /tmp/oct-bDEog8.o
remez.cc: In function ‘int Search(int, int*, int, double*)’:
remez.cc:389:3: error: ‘assert’ was not declared in this scope
  389 |   assert(extra >= 0);
      |   ^~~~~~
remez.cc:40:1: note: ‘assert’ is defined in header ‘<cassert>’; did you forget to ‘#include <cassert>’?
   39 | #include "octave-compat.h"
  +++ |+#include <cassert>
   40 |
remez.cc: In function ‘int remez(double*, int, int, const double*, const double*, const double*, int, int)’:
remez.cc:704:29: error: ‘assert’ was not declared in this scope
  704 |       for(i=0; i <= r; i++) assert(Ext[i]<gridsize);
      |                             ^~~~~~
remez.cc:704:29: note: ‘assert’ is defined in header ‘<cassert>’; did you forget to ‘#include <cassert>’?
make: *** [Makefile:48: remez.oct] Error 1

mxe-octave patch that makes it compile is here:

https://hg.octave.org/mxe-octave/rev/51670dbb688f

Discussion is here:

https://octave.discourse.group/t/assert-panic-error-and-ndebug/5409/18

Dmitri.
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