- fix Linux builds; now all dependencies are git submodules

.gitmodules

@@ -7,3 +7,6 @@
 	path = src/libs/libsrtp
 	url = git@git.sevana.biz:public/libsrtp.git
 	branch = master
+[submodule "src/libs/libraries"]
+	path = src/libs/libraries
+	url = git@git.sevana.biz:public/libraries.git

build_linux.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 from pathlib import Path
 import os
 import multiprocessing