opus-tools: don't unset _FORTIFY_SOURCE

should work now

mingw-w64-opus-tools/PKGBUILD

@@ -5,7 +5,7 @@ _realname=opus-tools
 pkgbase=mingw-w64-${_realname}
 pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
 pkgver=0.2
-pkgrel=3
+pkgrel=4
 pkgdesc="Collection of tools for Opus audio codec (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32')
@@ -27,8 +27,6 @@ build() {
   mkdir -p "${srcdir}/build-${MINGW_CHOST}"
   cd "${srcdir}/build-${MINGW_CHOST}"
 
-  CFLAGS+=" -U_FORTIFY_SOURCE"
-
   ../${_realname}-${pkgver}/configure \
     --prefix=${MINGW_PREFIX} \
     --build=${MINGW_CHOST} \