pkg-config: build without stack protector

it crashes otherwise

mingw-w64-pkg-config/PKGBUILD

@@ -4,7 +4,7 @@ _realname=pkg-config
 pkgbase=mingw-w64-${_realname}
 pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
 pkgver=0.29.2
-pkgrel=5
+pkgrel=6
 pkgdesc="A system for managing library compile/link flags (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32')
@@ -12,8 +12,6 @@ msys2_references=(
   'archlinux'
   'aur'
 )
-# XXX: buildflags makes things crash: needs investigation which one
-options=("!buildflags")
 url="https://www.freedesktop.org/wiki/Software/pkg-config/"
 license=('spdx:GPL-2.0-or-later')
 depends=("${MINGW_PACKAGE_PREFIX}-libwinpthread")
@@ -67,6 +65,9 @@ prepare() {
 build() {
   mkdir -p ${srcdir}/build-${MSYSTEM} && cd ${srcdir}/build-${MSYSTEM}
 
+  # XXX: pkg-config crashes otherwise on start (but not under gdb)
+  CFLAGS+=" -fno-stack-protector"
+
   CFLAGS+=" -Wno-int-conversion" \
   ../${_realname}-${pkgver}/configure \
     --prefix=${MINGW_PREFIX} \