misc: require getline

* bootstrap.conf: Here, used by src/location.c.
* src/getargs.c (long_options): Rename --flags to --feature.

build-aux/git-log-fix

@@ -1,3 +1,8 @@
 # This file is expected to be used via gitlog-to-changelog's --amend=FILE
 # option.  It specifies what changes to make to each given SHA1's commit
 # log and metadata, using Perl-eval'able expressions.
+
+0db2648930e3b6c376a539aabe368aade83ee29a
+s/--flags/--feature/;
+s/flag_flag/feature_flag/;
+s/\bflag\b/feature/;