Re: zig: update to 0.12.0.

[dkwo <dkwo@users.noreply.github.com>]

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New comment by dkwo on void-packages repository

https://github.com/void-linux/void-packages/pull/49935#issuecomment-2120983855

Comment:
New river and waylock are now out, which makes this PR viable.
However, the build style probably needs upgrading to use zig package manager, see e.g. https://codeberg.org/river/river/src/branch/master/PACKAGING.md

This works for me on x86_64 with static zig 0.12, but it needs some refinement to be included in void's build style:
```
 # Template file for 'river'
 pkgname=river
-version=0.2.4
-revision=3
+version=0.3.2
+revision=1
 archs="~i686* ~armv6l* ~armv7l*"
 build_style=zig-build
-configure_args="$(vopt_if xwayland -Dxwayland) -Dpie"
-hostmakedepends="pkg-config wayland-devel scdoc"
-makedepends="wlroots0.16-devel libevdev-devel pixman-devel
+hostmakedepends="pkg-config wayland-devel scdoc"
+makedepends="wlroots0.17-devel libevdev-devel pixman-devel
  wayland-protocols libxkbcommon-devel wayland-devel"
-depends="$(vopt_if xwayland xorg-server-xwayland)"
+depends="xorg-server-xwayland"
 short_desc="Dynamic tiling Wayland compositor"
 maintainer="Orphaned <orphan@voidlinux.org>"
 license="GPL-3.0-only"
 homepage="https://codeberg.org/river/river"
 distfiles="https://codeberg.org/river/river/releases/download/v${version}/river-${version}.tar.gz"
-checksum=26c1c41a65ce3804069afad6988410515cf478d2b76303ebc699766d3d4dc69f
+checksum=acb273487eb0cf9222c14e050c0faad692f426dba599b62e4c743ba43328ee9e
+_deps="https://codeberg.org/ifreund/zig-pixman/archive/v0.1.0.tar.gz
+ https://codeberg.org/ifreund/zig-wayland/archive/v0.1.0.tar.gz
+ https://codeberg.org/ifreund/zig-wlroots/archive/v0.17.0.tar.gz
+ https://codeberg.org/ifreund/zig-xkbcommon/archive/v0.1.0.tar.gz"
 
-build_options="xwayland"
-build_options_default="xwayland"
-desc_option_xwayland="Enable Xwayland support"
+post_fetch() {
+       for _d in $_deps; do
+               zig fetch --global-cache-dir $XBPS_BUILDDIR/zig-input $_d
+       done
+}
+
+do_build() {
+       DESTDIR="zig-out" zig build --system $XBPS_BUILDDIR/zig-input/p -Doptimize=ReleaseSafe -Dpie -Dxwayland --prefix /usr -Dcpu=baseline install
+}
+
+do_check() {
+       zig build --system $XBPS_BUILDDIR/zig-input/p test
+}
```