Updating make/configure for hdrrwr lib includes

[ezelkow1]

Try to clean up ambiguities around geo library includes for header rewrite

May help resolve issues around #12862

[Copilot]

Pull request overview

This PR updates the build configuration for the header_rewrite plugin to resolve ambiguities in geo library includes. It renames build conditionals from HAS_MAXMINDDB/HAS_GEOIP to USE_HRW_MAXMINDDB/USE_HRW_GEOIP and adds proper validation for the --with-hrw-geo-provider configuration option.

Changes:

• Renamed build conditionals to use USE_HRW_* prefix instead of HAS_* for clarity
• Added validation to fail early if a geo provider is specified but the library is not found
• Improved error message to list valid geo provider options

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
plugins/header_rewrite/Makefile.inc	Updated conditional compilation directives to use new USE_HRW_* variable names
configure.ac	Added library availability checks, improved error messages, and defined AM_CONDITIONAL macros for the new variable names

[bryancall]

Looks good. The rename from HAS_GEOIP/HAS_MAXMINDDB to USE_HRW_GEOIP/USE_HRW_MAXMINDDB correctly gates the Makefile conditionals on the user's provider selection rather than just library presence. The early-fail validation and improved error message are nice additions.

Minor note: the old AM_CONDITIONAL([HAS_GEOIP], ...) and AM_CONDITIONAL([HAS_MAXMINDDB], ...) definitions are still in configure.ac and are now unused, but that's not a blocker.