devel/glib20: Prevent the silent grabbing of libelf from ports

PR:		273479

devel/glib20/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	glib
 DISTVERSION=	2.84.1
-PORTREVISION=	1
+PORTREVISION=	2
 PORTEPOCH=	2
 CATEGORIES=	devel
 MASTER_SITES=	GNOME
@@ -42,6 +42,7 @@ MESON_ARGS=	-Db_lundef=false \
 		-Ddefault_library=both \
 		-Dfile_monitor_backend='libinotify-kqueue' \
 		-Dinstalled_tests=false \
+		-Dlibelf=disabled \
 		-Dlibmount=disabled \
 		-Druntime_dir=/var/run \
 		-Dselinux=disabled \

devel/glib20/files/patch-gio_gresource-tool.c

@@ -0,0 +1,15 @@
+--- gio/gresource-tool.c.orig	2025-04-03 14:38:51 UTC
++++ gio/gresource-tool.c
+@@ -31,8 +31,10 @@
+ #include <locale.h>
+ 
+ #ifdef HAVE_LIBELF
+-#include <libelf.h>
+-#include <gelf.h>
++#include </usr/include/libelf.h>
++// fool libelf from ports to not include its libelf.h
++#define _LIBELF_H 1
++#include </usr/include/gelf.h>
+ #endif
+ 
+ #ifdef HAVE_MMAP

devel/glib20/files/patch-gio_meson.build

@@ -0,0 +1,11 @@
+--- gio/meson.build.orig	2025-04-03 14:38:51 UTC
++++ gio/meson.build
+@@ -971,7 +971,7 @@ else
+   # This fallback is necessary on *BSD. elfutils isn't the only libelf
+   # implementation, and *BSD usually includes their own libelf as a system
+   # library which doesn't have a corresponding .pc file.
+-  libelf = cc.find_library('elf', required : get_option ('libelf'))
++  libelf = declare_dependency(link_args: '/lib/libelf.so.2')
+   have_libelf = libelf.found()
+   have_libelf = have_libelf and cc.has_function('elf_begin', dependencies : libelf)
+   have_libelf = have_libelf and cc.has_function('elf_getshdrstrndx', dependencies : libelf)