pam-modules: fixed misspelled binary name in unix2_chkpwd.8

This update fixes the following issues for pam-modules:
- Do not use private glibc macros - those are not available with glibc 2.16 anymore.
- bnc#770896: fixed misspelled binary name in unix2_chkpwd.8

Fixed bugs
bnc#770896
pam-modules: misspelled binary name in unix2_chkpwd.8
Selected Binaries
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