Enable compiling the X Server and modules with hidden symbols by default.
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.
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