hppa: Drop old parisc-specific MADV_* constants

The Linux kernel upstream commit 71bdea6f798b ("parisc: Align parisc
MADV_XXX constants with all other architectures") dropped the
parisc-specific MADV_* values in favour of the same constants as
other architectures. In the same commit a wrapper was added which
translates the old values to the standard MADV_* values to avoid
breakage of existing programs.

This upstream patch has been downported to all stable kernel trees as
well.

This patch now drops the parisc specific constants from glibc to
allow newly compliled programs to use the standard MADV_* constants.

v2: Added NEWS section, based on feedback from Florian Weimer

Signed-off-by: Helge Deller <deller@gmx.de>