FTBFS on Debian hurd and kfreebsd

Hello,

glvnd FTBFS on Debian hurd and kfreebsd architectures because of errors like:

src/GL/libGL.so.1.7.0: unknown symbol exported: __bss_start
src/GL/libGL.so.1.7.0: unknown symbol exported: _edata
src/GL/libGL.so.1.7.0: unknown symbol exported: _end

Apparently 'bin/symbols-check.py' only detects the Linux architectures properly, but these seems to be added when compiling with the GNU libc, not only on Linux

Python gives:

On kfreebsd:

>>> platform.system()
'GNU/kFreeBSD'

and on hurd:

>>> platform.system()
'GNU'

Can this be adjusted?