Update build scripts.

scripts/build.libressl.sh

@@ -0,0 +1,20 @@
+#!/bin/bash -e
+
+LIBRESSL_VERSION="3.0.2"
+
+mkdir -p deps
+mkdir -p deps/include
+mkdir -p deps/lib
+
+mkdir -p build && cd build
+
+wget https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-${LIBRESSL_VERSION}.tar.gz -O libressl-${LIBRESSL_VERSION}.tar.gz
+tar -xzf libressl-${LIBRESSL_VERSION}.tar.gz
+
+cd libressl-${LIBRESSL_VERSION}
+./configure --disable-shared
+make -j$(nproc)
+cp -fr include/ ../../deps
+cp crypto/.libs/libcrypto.a ../../deps/lib
+cp ssl/.libs/libssl.a ../../deps/lib
+cd ..