games-engines/xsystem4: correctly stub out git for version retrieval

Previously, we were looking for a patch that doesn't exist (${PV} !=
${PVR}), while the existing patch failed to apply. Even if it did, it
didn't mitigate meson calling dev-vcs/git.

* Add missing issue number for workaround 05ae4e62c9
  ("games-engines/xsystem4: workaround cglm memory alignment issue").

Fixes: 7d076ee0c0
Signed-off-by: Lucio Sauer <watermanpaint@posteo.net>

games-engines/xsystem4/files/version_1.0.0-r1.patch

@@ -1,9 +0,0 @@
-diff -ur a/src/meson.build b/src/meson.build
---- a/src/meson.build	2025-09-29 02:52:05.000000000 +0100
-+++ b/src/meson.build	2025-09-30 14:58:30.420678438 +0100
-@@ -1,5 +1,5 @@
- version_h = vcs_tag(command) : ['git', 'descrive', 'HEAD'],
--                    fallback : 'unknown version',
-+                    fallback : '1.0.0',
-                     input : 'version.h.in',
-                     output : 'version.h')

games-engines/xsystem4/xsystem4-1.0.0-r2.ebuild

@@ -53,11 +53,6 @@ BDEPEND="
 	virtual/pkgconfig
 "
 
-# Patch to correct version number for each release, patch must be edited for each new version
-PATCHES=(
-	"${FILESDIR}"/version_"${PV}".patch
-)
-
 src_unpack() {
 	default
 
@@ -65,13 +60,18 @@ src_unpack() {
 	mv "${WORKDIR}"/libsys4-${LIBSYS4_COMMIT}/ "${S}"/subprojects/libsys4 || die
 }
 
+src_prepare() {
+	sed -i "s/'git', 'describe', 'HEAD'/'echo', '${PV}'/" src/meson.build || die
+	default
+}
+
 src_configure() {
 	local emesonargs=(
 		$(meson_feature debug debugger)
 		$(meson_feature gles2 opengles)
 
 		# Workaround for unaligned memory access with cglm+AVX
-		# See: https://github.com/nunuhara/xsystem4/issues/XXX
+		# See: https://github.com/nunuhara/xsystem4/issues/294
 		-Dc_args="-DCGLM_ALL_UNALIGNED"
 	)