Add libsodium to the depends system.

depends/packages/libsodium.mk

@@ -0,0 +1,23 @@
+package=libsodium
+$(package)_version=1.0.8
+$(package)_download_path=https://download.libsodium.org/libsodium/releases/
+$(package)_file_name=libsodium-1.0.8.tar.gz
+$(package)_sha256_hash=c0f191d2527852641e0a996b7b106d2e04cbc76ea50731b2d0babd3409301926
+$(package)_dependencies=
+$(package)_config_opts=
+
+define $(package)_preprocess_cmds
+  cd $($(package)_build_subdir); ./autogen.sh
+endef
+
+define $(package)_config_cmds
+  $($(package)_autoconf) --enable-static --disable-shared
+endef
+
+define $(package)_build_cmds
+  $(MAKE)
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install
+endef

depends/packages/packages.mk

@@ -1,4 +1,4 @@
-zerocash_packages := libsnark crypto++ libgmp
+zerocash_packages := libsnark crypto++ libgmp libsodium
 packages:=boost openssl $(zerocash_packages)
 native_packages := native_ccache native_comparisontool