Fix build with gcc-14 and clang

Origin: Combiened from original patches posted to Gentoo bugzilla
Author: David Betancur Vallejo <sunset666@sunset666.net>
Bug: https://bugs.gentoo.org/509696
Bug: https://bugs.gentoo.org/870574
Bug: https://bugs.gentoo.org/920356
--- a/server/gam_connection.c	2007-07-04 09:36:49.000000000 -0400
+++ b/server/gam_connection.c	2025-06-10 23:55:11.300403185 -0400
@@ -19,6 +19,7 @@
 #include "gam_inotify.h"
 #endif
 #include "fam.h"
+#include "gam_excludes.h"
 
 /************************************************************************
  *									*
--- a/server/gam_eq.c	2007-07-04 09:36:49.000000000 -0400
+++ b/server/gam_eq.c	2025-06-10 23:57:02.457123587 -0400
@@ -124,7 +124,7 @@
 {
 	gboolean done_work = FALSE;
 	if (!eq)
-		return;
+		return done_work;
 
 #ifdef GAM_EQ_VERBOSE
 	GAM_DEBUG(DEBUG_INFO, "gam_eq: Flushing event queue for %s\n", gam_connection_get_pidname (conn));
--- a/server/gam_inotify.c	2025-06-10 23:58:55.040118509 -0400
+++ b/server/gam_inotify.c	2025-06-10 23:58:47.249981960 -0400
@@ -30,6 +30,7 @@
 #include "gam_server.h"
 #include "gam_subscription.h"
 #include "gam_inotify.h"
+#include "gam_poll_basic.h"
 
 /* Transforms a inotify event to a gamin event. */
 static GaminEventType
--- a/server/gam_listener.c	2007-07-04 09:36:49.000000000 -0400
+++ b/server/gam_listener.c	2025-06-10 23:39:04.914127952 -0400
@@ -25,6 +25,7 @@
 #include "gam_server.h"
 #include "gam_error.h"
 #include "gam_pidname.h"
+#include "gam_excludes.h"
 #ifdef ENABLE_INOTIFY
 #include "gam_inotify.h"
 #endif
--- a/server/gam_server.h	2025-06-10 23:52:52.003110180 -0400
+++ b/server/gam_server.h	2025-06-10 23:52:07.096202211 -0400
@@ -79,6 +79,8 @@
 gboolean	gam_poll_remove_all_for		(GamListener *listener);
 GaminEventType	gam_poll_file			(GamNode *node);
 
+extern void gam_error_init(void);
+
 #ifdef __cplusplus
 }
 #endif