Note that it checks if support for symbol visibility is available by
the compiler, not if it is functional. It may have problems on non x86
architectures.
To disable the feature, just pass the option "--disable-visibility"
to the X Server configure script.
Unless using an alternate build schema, drivers built from a git
checkout will use the same "visibility" related CFLAGS used to compile
the X Server.
Get rid of almost all uses of these definitions. They're still defined for
delinquent out-of-tree drivers, and also for the Mesa build. As well as
for miinitext.c. But largely gone.
overridden at make install time.
Remove driverdir and inputdir from pkg-config file. The directory layout of
moduledir is fixed and well known by drivers.
