Add primary_node_info inline function

When a t_node_info struct must be re initilised, it was re-declared
only. Moreover, a macro was user for any var creation of this type
impeding use the same to reset the values later if needed.

This new function allows to re initilise again a t_node_info typed
variable without the need to redeclare it to create other varibles for
the same purpose, and also shadowing is now avoided from pg16.

Macros seems to be replaced by `static inline` functions in upstream
postgres, credits to  Alvaro Herrera <alvherre@alvh.no-ip.org> for this
idea.

References: HL-40

HISTORY

@@ -1,9 +1,4 @@
-5.5.0   2024-11-20
+5.4.1   2023-??-??
-        Support for PostgreSQL 17 added
-        Fix warnings detected by the -Wshadow=compatible-local
-          added in PostgreSQL 16
-
-5.4.1   2023-07-04
         repmgrd: ensure witness node metadata is updated (Ian)
 
 5.4.0   2023-03-16

doc/appendix-release-notes.xml

@@ -16,24 +16,9 @@
   </para>
 
   <!-- remember to update the release date in ../repmgr_version.h.in -->
-
-  <sect1 id="release-5.5.0">
-    <title>Release 5.5.0</title>
-    <para><emphasis>Wed 20 November, 2024</emphasis></para>
-    <para>
-      &repmgr; 5.5.0 is a major release.
-    </para>
-    <para>
-      This release adds support for PostgreSQL 17
-    </para>
-    <para>
-      Fixes warnings detected by the -Wshadow gcc flag added in PostgreSQL 16.
-    </para>
-  </sect1>
-
   <sect1 id="release-5.4.1">
     <title id="release-current">Release 5.4.1</title>
-    <para><emphasis>Tue 04 Jul, 2023</emphasis></para>
+    <para><emphasis>??? ?? ??????, 202?</emphasis></para>
     <para>
       &repmgr; 5.4.1 is a minor release providing ...
     </para>

doc/repmgr.xml

@@ -26,7 +26,7 @@
   <abstract>
    <para>
    This is the official documentation of &repmgr; &repmgrversion; for
-   use with PostgreSQL 12 - PostgreSQL 17.
+   use with PostgreSQL 9.4 - PostgreSQL 15.
    </para>
    <para>
      &repmgr; is being continually developed and we strongly recommend using the

repmgr.control

@@ -1,6 +1,6 @@
 # repmgr extension
 comment = 'Replication manager for PostgreSQL'
-default_version = '5.5'
+default_version = '5.4'
 module_pathname = '$libdir/repmgr'
 relocatable = false
 schema = repmgr