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os: unexport Fopen(), Fclose(), Popen(), Pclose(), System()

Enrico Weigelt, metux IT consult . requested to merge metux/xserver:submit/unexport-file-func into master

os: unexport Fopen(), Fclose(), Popen(), Pclose(), System()

These functions are just used for reading auth file or calling xkbcomp while dropping privileges, in case the Xserver is started as unprivileged user with suid-root. Thus, shouldn't be used (and aren't used) by drivers.

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