gh-40065: patching gfan

This fixes failed build on OSX:
```
[gfan-0.6.2.p1] [spkg-install] In file included from
src/gfanlib_zcone.cpp:8:
[gfan-0.6.2.p1] [spkg-install] In file included from
src/gfanlib_zcone.h:11:
[gfan-0.6.2.p1] [spkg-install] src/gfanlib_matrix.h:123:18: error: no
member named 'vectormultiply' in 'Matrix<typ>'
[gfan-0.6.2.p1] [spkg-install]   123 |
ret[i]=a.vectormultiply(b.column(i));
[gfan-0.6.2.p1] [spkg-install]       |                ~ ^
[gfan-0.6.2.p1] [spkg-install] 1 error generated.
[gfan-0.6.2.p1] [spkg-install] make[3]: *** [src/gfanlib_zcone.o] Error
1
```

@fchapoton already implemented this fix in Singular https://github.com/f
chapoton/Singular/commit/d3f73432d73ac0dd041af83cb35301498e9b57d9

### Boring details

this comments out a method
```c++
  friend Matrix operator*(const Matrix& a, const Matrix& b)
    {
      assert(a.width==b.height);
      Matrix ret(b.width,a.height);
      for(int i=0;i<b.width;i++)
        ret[i]=a.vectormultiply(b.column(i));
      return ret.transposed();
    }
```

which depends on a method already commented out (that also doesn't parse
as valid code)
```c++
  /*IntegerVector vectormultiply(IntegerVector const &v)const
    {
      assert(v.size()==width);
      IntegerVector ret(height);
      for(int i=0;i<height;i++)
        ret[i]=dot(rows[i],v);
      return ret;
    }*/
```

URL: #40065
Reported by: Edgar Costa
Reviewer(s): Frédéric Chapoton

Author: Release Manager

build/pkgs/configure/checksums.ini

@@ -1,3 +1,3 @@
 tarball=configure-VERSION.tar.gz
-sha1=ccd2ea260f6193ef117e33345b48cb5ba773144a
-sha256=d40b2445b4973363e7f614a279fbdadeb7c977900091d2b6b619238c5073cdcf
+sha1=d79951dd1a219bc39b6b9158b51394b96a4a5de1
+sha256=2199f2602aea198d7268a67f396433201b4fa6b7bc53423d777077e598053045

build/pkgs/configure/package-version.txt

@@ -1 +1 @@
-14e996467f713ae5f7f77357bcbb7753443010b4
+e8053e470a5f2e1cceedb0e76df3a57b31440eb2

build/pkgs/gfan/patches/gfanlib_matrix.patch

@@ -0,0 +1,20 @@
+diff --git a/gfanlib/gfanlib_matrix.h b/gfanlib/gfanlib_matrix.h
+index cb5c35de8..fa5b82092 100644
+--- a/src/gfanlib_matrix.h
++++ b/src/gfanlib_matrix.h
+@@ -115,6 +115,7 @@ public:
+                   p[i][j]=s*(q[i][j]);
+       return p;
+     }
++  /*
+   friend Matrix operator*(const Matrix& a, const Matrix& b)
+     {
+       assert(a.width==b.height);
+@@ -123,6 +124,7 @@ public:
+         ret[i]=a.vectormultiply(b.column(i));
+       return ret.transposed();
+     }
++  */
+   /*  template<class T>
+     Matrix<T>(const Matrix<T>& c):v(c.size()){
+     for(int i=0;i<size();i++)v[i]=typ(c[i]);}