main/gmp: fix libtool version mismatch

We need to regenerate the autconf due to libtool 2.4.7 upgrade so we
don't get a libtool version mismatch.

main/gmp/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=gmp
 pkgver=6.2.1
-pkgrel=1
+pkgrel=2
 pkgdesc="free library for arbitrary precision arithmetic"
 url="https://gmplib.org/"
 arch="all"
 license="LGPL-3.0-or-later OR GPL-2.0-or-later"
-makedepends="m4 texinfo libtool"
+makedepends="m4 texinfo libtool autoconf automake"
 subpackages="$pkgname-doc $pkgname-dev libgmpxx"
 source="https://gmplib.org/download/gmp/gmp-$pkgver.tar.xz
 	CVE-2021-43618.patch::https://gmplib.org/repo/gmp-6.2/raw-rev/561a9c25298e
@@ -20,7 +20,7 @@ replaces="gmp5"
 prepare() {
 	default_prepare
 	# force update to libtool with fixed cross-build support
-	libtoolize -f
+	autoreconf -vif
 }
 
 build() {