Fix compilation errors:

  dolfin/geometry/IntersectionConstruction.cpp: In static member function ‘static std::vector<dolfin::Point> dolfin::IntersectionConstruction::intersection_segment_segment_2d(const dolfin::Point&, const dolfin::Point&, const dolfin::Point&, const dolfin::Point&)’:
  dolfin/geometry/IntersectionConstruction.cpp:442:24: error: ‘min_element’ is not a member of ‘std’; did you mean ‘tuple_element’?
    442 |   const auto it = std::min_element(oo.begin(), oo.end());
        |                        ^~~~~~~~~~~
        |                        tuple_element

  dolfin/mesh/MeshFunction.h: In member function ‘std::vector<long unsigned int> dolfin::MeshFunction<T>::where_equal(T)’:
  dolfin/mesh/MeshFunction.h:652:26: error: ‘count’ is not a member of ‘std’; did you mean ‘cout’?
    652 |     std::size_t n = std::count(_values.get(), _values.get() + _size, value);
        |                          ^~~~~
        |                          cout

Submitted upstream at https://bitbucket.org/fenics-project/dolfin/issues/1128

--- a/dolfin/geometry/IntersectionConstruction.cpp
+++ b/dolfin/geometry/IntersectionConstruction.cpp
@@ -18,7 +18,8 @@
 // First added:  2014-02-03
 // Last changed: 2017-12-12
 
+#include <algorithm>
 #include <iomanip>
 #include <dolfin/mesh/MeshEntity.h>
 #include "predicates.h"

--- a/dolfin/mesh/MeshFunction.h
+++ b/dolfin/mesh/MeshFunction.h
@@ -24,6 +24,7 @@
 #ifndef __MESH_FUNCTION_H
 #define __MESH_FUNCTION_H
 
+#include <algorithm>
 #include <map>
 #include <vector>
 
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<div class='path'>path: <a href='/guix/log/?id=f8953bea858f894b406eed4a0aca0cd4c4d8671d'>root</a>/<a href='/guix/log/gnu?id=f8953bea858f894b406eed4a0aca0cd4c4d8671d'>gnu</a>/<a href='/guix/log/gnu/packages?id=f8953bea858f894b406eed4a0aca0cd4c4d8671d'>packages</a>/<a href='/guix/log/gnu/packages/openldap.scm?id=f8953bea858f894b406eed4a0aca0cd4c4d8671d'>openldap.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/openldap.scm?id=f8953bea858f894b406eed4a0aca0cd4c4d8671d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-03-04 01:39:07 +0100'>2021-03-04</span></td><td><a href='/guix/commit/gnu/packages/openldap.scm?id=22ef895d2481964bf72b04bb5b4195c8cfb94754'>gnu: 389-ds-base: Update to 1.4.0.31 [security fixes].</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/openldap.scm (389-ds-base): Update to 1.4.0.31.
</span></span></td><td>Léo Le Bouter</td></tr>
<tr><td><span title='2021-02-11 15:02:53 -0500'>2021-02-11</span></td><td><a href='/guix/commit/gnu/packages/openldap.scm?id=a18492118cc73bee9a2e6424363e3e072572f52e'>gnu: OpenLDAP: Update to 2.4.57 [security fixes].</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes CVE-2020-{36221,36222,36223,36224,36225,36226,36226,36228,36229,36230}.

* gnu/packages/openldap.scm (openldap-2.4.57): New variable.
(openldap)[replacement]: New field.
</span></span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2020-12-08 14:13:37 +0100'>2020-12-08</span></td><td><a href='/guix/commit/gnu/packages/openldap.scm?id=df4feb9e8b59dba373c29844b0dbb701266b4ffa'>gnu: openldap: Update to 2.4.50 and remove replacement.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/openldap.scm (openldap): Update to 2.4.50.
[replacement]: Remove.
(openldap-2.4.50): Remove.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-22 18:41:58 +0200'>2020-09-22</span></td><td><a href='/guix/commit/gnu/packages/openldap.scm?id=758fb0478eb48ff173b0036beb27656c716b050d'>gnu: python-ldap: Update to 3.3.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/openldap.scm (python-ldap): Update to 3.3.1.
</span></span></td><td>Marius Bakke</td></tr>