Change link visibility rules on Linux
Change link visibility rules on Linux

To prevent ourselves from having to ship our own versions of
libapr-accre.so and libapr-util-accre.so, we statically link those
libraries against our own libraries and executables. Unfortunately,
the linker still wants to make the symbols from apr visibile, which
would cause problems if lstore was being linked against something who
was, in turn, linking against the stock apr library from the distro.

Instruct the linker to hide the additional symbols.

tacketar/lstore,tacketar/lstore,accre/lstore,accre/lstore,tacketar/lstore,tacketar/lstore,accre/lstore,accre/lstore