Describe the bug
When building libssh2 on hurd* systems, the tests fail to build because MAXPATHLEN is not defined on those systems:

session_fixture.c:231:36: error: ‘MAXPATHLEN’ undeclared (first use in
this function)
  231 |     static char filepath[NUMPATHS][MAXPATHLEN];
      |                                    ^~~~~~~~~~

See Debian build logs on hurd-i386

Version (please complete the following information):

• OS and version: Debian hurd i386 and Debian hurd amd64
• libssh2 version: 1.11.0
• crypto backend and version: OpenSSL 3.2.2

Additional context
The build issue is in the test file tests/session_fixture.c

The bug open in debian is #1068076