main/nmap: fix build with automake 1.17

This fixes the "aclocal-1.16: not found" error (on all archs):
https://build.alpinelinux.org/buildlogs/build-edge-loongarch64/main/nmap/nmap-7.95-r0.log

main/nmap/APKBUILD

@@ -1,7 +1,7 @@
 # Maintainer: Leonardo Arena <rnalrd@alpinelinux.org>
 pkgname=nmap
 pkgver=7.95
-pkgrel=0
+pkgrel=1
 pkgdesc="network exploration tool and security/port scanner"
 url="https://nmap.org"
 arch="all"
@@ -9,6 +9,7 @@ license="custom"
 makedepends="
 	autoconf
 	automake
+	libtool
 	libpcap-dev
 	libssh2-dev
 	linux-headers
@@ -36,6 +37,8 @@ source="https://nmap.org/dist/nmap-$pkgver.tar.bz2
 prepare() {
 	default_prepare
 	update_config_sub
+
+	autoreconf libpcre libdnet-stripped -ivf
 }
 
 build() {