1.24.x Regression: Cannot compile with glibc<2.12(MNT_DETACH is not defined)

[Lélio]

Hello, 

glibc2.2+ is supported according to the FAQ, but the symbol MNT_DETACH is not defined in sys/mount.h in glibc<2.10 (this symbol is defined in the kernel (in fs.h) but has not been ported to glibc).

This prevents util-linux/umount.c from compiling. This regression has been introduced by the commit c919d561ad.

This is already worked around in init/bootchartd.c with a conditional include. In order to avoid redundant code, it might be better to fix this define in libbb.h. The attached patch fixes the issue.

Best, 
Lélio 
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