doc: Mention new glibc headers and functions.

[pspp] / .gitattributes

# See lib/git-merge-changelog.c for making this useful.
ChangeLog       merge=merge-changelog

# Run this to make 'git diff' on texinfo files give nicer hunk context:
#   git config diff.texinfo.funcname '^@node[    ][      ]*\\([^,][^,]*\\)'
*.texi* diff=texinfo