Add linux build support.

build/build-linux.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+cd "$(dirname "$0")"
+
+apt install libportaudio2
+
+pip3 install -r requirements.txt
+pip3 install -r requirements-linux.txt
+pip3 install -e ..\
+
+python3 ./generate-build-exe-config.py
+
+python3 ./build-exe.py
+
+bash ./build-exe-pyinstaller-command.sh
+
+rm ./*.spec
+

build/requirements-linux.txt

@@ -0,0 +1 @@
+pyinstaller