[Octave-patch-tracker] [patch #8919] Start of patch to enable visibility attributes for GCC in build system

[Markus Mützel]

Follow-up Comment #27, patch #8919 (project octave):

When I started working on this again, I was expecting (or hoping) that Windows
would be the only "odd-ball" here. I hoped that the other platforms would
behave quite uniformly.
It turns out this is not the case: Even different compilers (gcc and clang)
for the same platform (Linux) interpret the visibility attributes
differently.

Maybe we should use visibility more conservatively or make it optional. But it
is also possible to wait for users on different platforms (darwin?) to report
if they see issues.

Meanwhile, I pushed a partial fix for compiling with clang here:
https://hg.savannah.gnu.org/hgweb/octave/rev/f207504ae98d

This still won't lead to a successful build with clang. But the linker will
complain about less missing symbols...

It takes some time to find something that works with gcc and with clang and
doesn't break the Windows build. And sometimes it is not clear to me why
something breaks. So, I'll try and push smaller changes that seem to be
working...

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