pcre: autoreconf to fix clang builtins linking

mingw-w64-pcre/PKGBUILD

@@ -4,7 +4,7 @@ _realname=pcre
 pkgbase=mingw-w64-${_realname}
 pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
 pkgver=8.44
-pkgrel=2
+pkgrel=3
 pkgdesc="A library that implements Perl 5-style regular expressions (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64')
@@ -22,6 +22,11 @@ sha256sums=('19108658b23b3ec5058edc9f66ac545ea19f9537234be1ec62b714c84399366d'
             'SKIP')
 validpgpkeys=('45F68D54BBE23FB3039B46E59766E084FB0F43D8')
 
+prepare() {
+  cd "${srcdir}/${_realname}-${pkgver}"
+  autoreconf -fiv
+}
+
 build() {
   [[ -d ${srcdir}/build-${MINGW_CHOST} ]] && rm -rf ${srcdir}/build-${MINGW_CHOST}
   mkdir -p "${srcdir}/build-${MINGW_CHOST}" && cd "${srcdir}/build-${MINGW_CHOST}"