Add libsodium to the tree and build what's needed from source.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3859 ed5197a5-7fde-0310-b194-c3ffbd925b24

deps/libsodium/dist-build/Makefile.am

@@ -0,0 +1,17 @@
+
+EXTRA_DIST = \
+	android-build.sh \
+	android-arm.sh \
+	android-armv7-a.sh \
+	android-armv8-a.sh \
+	android-mips32.sh \
+	android-mips64.sh \
+	android-x86.sh \
+	android-x86_64.sh \
+	emscripten.sh \
+	ios.sh \
+	apple-xcframework.sh \
+	msys2-win32.sh \
+	msys2-win64.sh \
+	watchos.sh \
+	wasm32-wasi.sh