unistd: warn on use of environ without module _GL_WARN_ON_USE only works for functions; so we wrap access to environ through a function when CFLAGS has -DGNULIB_POSIXCHECK=1. * modules/unistd (Depends-on): Add warn-on-use. (Makefile.am): Provide new substitutions. * m4/unistd_h.m4 (gl_UNISTD_H): Check for inline and environ. * lib/unistd.in.h (environ): Wrap with a warning helper function. Signed-off-by: Eric Blake <ebb9@byu.net>

# 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