pacman: build with -fzero-init-padding-bits=unions

what a nice gcc 15 "feature"...

pacman/PKGBUILD

@@ -4,7 +4,7 @@
 
 pkgname=pacman
 pkgver=6.1.0
-pkgrel=17
+pkgrel=18
 pkgdesc="A library-based package manager with dependency support (MSYS2 port)"
 arch=('i686' 'x86_64')
 url="https://www.archlinux.org/pacman/"
@@ -186,6 +186,9 @@ prepare() {
 build() {
   cd ${srcdir}/${pkgname}
 
+  # https://gitlab.archlinux.org/pacman/pacman/-/issues/254#note_289040
+  CFLAGS+=" -fzero-init-padding-bits=unions"
+
   LDFLAGS+=" -static-libgcc" \
   meson setup build-${CARCH} \
     --buildtype=plain \