www/webkit2-gtk: properly expose roundeven{,f} on 32-bit platforms

The preprocessor guard only accounts for Linux without glibc, but
we don't have these C23 functions yet either.

Reported and tested by: fuz, makc, dinoex
Differential Revision: https://reviews.freebsd.org/D50138

www/webkit2-gtk: fix configure with ruby 3.4

Add getoptlong unconditionally to BUILD_DEPENDS

/usr/local/lib/ruby/3.4/did_you_mean/core_ext/name_error.rb:11: warning:
getoptlong is not part of the default gems starting from Ruby 3.4.0. Install
getoptlong from RubyGems.
<internal:/usr/local/lib/ruby/3.4/rubygems/core_ext/kernel_require.rb>:136:in
'Kernel#require': cannot load such file -- getoptlong (LoadError)
	from
<internal:/usr/local/lib/ruby/3.4/rubygems/core_ext/kernel_require.rb>:136:in
'Kernel#require'
	from
/wrkdirs/usr/ports/www/webkit2-gtk/work-60/.build/WTF/Scripts/generate-unified-source-bundles.rb:27:in
'<main>'
CMake Error at Source/cmake/WebKitMacros.cmake:30 (message):
  generate-unified-source-bundles.rb exited with non-zero status, exiting

gnome.mk: rename gdkpixbuf2 to gdkpixbuf to prepare for port move

The GTK 1-based gdk-pixbuf has not existed for some time.

No functional or package changes.

www/webkit2-gtk: update to 2.46.6

Release notes: https://webkitgtk.org/2025/02/07/webkitgtk2.46.6-released.html

www/webkit2-gtk: fix build on aarch64

Add some missing arch-specific bits.

Approved by:	portmgr (build fix blanket)

*/*: Bump consumers of devel/icu

...to avoid library mismatches

www/webkit2-gtk: remove byteRangeSample from PlatformSample

The presence of this union member causes the build to fail with our
libc++ because version 1 ABI's std::pair does not have a trivial
copy constructor (see D35327). However this code is only used for
a deprecated plugin only for macOS, and it along with supporting
code like this have been removed in the main branch upstream, so
this should hold in the upcoming 2.48 series. For now, only remove
byteRangeSample as the complete upstream commit does not apply.

This allows the port to return to using the base system toolchain,
including libc++, fixing crashes from mangling libc++-built
dependencies with libstdc++ webkitgtk. While here, remove some
unused USE_X11 depends to save another PORTREVISION bump.

Reference:
https://github.com/WebKit/WebKit/commit/d0527fca8fc20cdda907dfdc293323d7283bd262
PR: 284378
Reported by: huanghwh[at]gmail[dot]com
Tested by: eduardo, shamaz.mazum[at]gmail[dot]com (previous iterations)

www/webkit2-gtk: remove no longer needed WPE dependencies since 2.44

Reported by: shamaz.mazum[at]gmail[dot]com
PR: 275914

www/webkit2-gtk: update to 2.46.5

Changelog:
https://github.com/WebKit/WebKit/blob/webkitgtk-2.46.5/Source/WebKit/gtk/NEWS

Now consolidated into one port with flavours since the codebase is
the same, just linked with different libraries resulting in different
SONAMEs and APIs. SONAMEs/flavours:

* GTK3 + libsoup = libwebkit2gtk-4.0 (40)
* GTK3 + libsoup3 = libwebkit2gtk-4.1 (41)
* GTK4 + libsoup3 = libwebkitgtk-6.0 (60)

Despite upstream's recommendation to use clang for better skia
optimisation, this port now USE_GCC due to extensive std::pair copy
constructor use that is not trivial to continue patching to stay
working with our libc++ version 1 ABI. See review D35327 for some
details.

Reported by: eduardo
PR: 275914
Differential Revision: https://reviews.freebsd.org/D45878