move to new build system

support/3rd_party/libsodium_configure.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+if [ "$1" == "mingw64" ]; then
+  HOST_CFG=--host=x86_64-w64-mingw32
+fi
+
+CFLAGS="-O3 -fomit-frame-pointer -march=$2 -mtune=generic" ./configure \
+  --disable-asm \
+  --disable-ssp \
+  --enable-shared=$4 \
+  --enable-static=yes \
+  --prefix="$3" \
+  ${HOST_CFG}