build: Add wrapper scripts to simplify building

BSDmakefile

@@ -0,0 +1,6 @@
+all: .DEFAULT
+
+.DEFAULT:
+	@gmake ${.MAKEFLAGS} ${.TARGETS}
+
+.PHONY: all

Makefile

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+PYTHON ?= $(shell which python3 >/dev/null && echo python3 || echo python)
+
+all $(MAKECMDGOALS):
+	@$(PYTHON) \
+		-c "import sys; sys.path.insert(0, sys.argv[1]); from releng.meson_make import main; main()" \
+		"$(shell pwd)" \
+		./build \
+		$(MAKECMDGOALS)
+
+git-submodules:
+	@if [ ! -f releng/meson/meson.py ]; then \
+		git submodule update --init --recursive --depth 1; \
+	fi
+-include git-submodules
+
+.PHONY: all $(MAKECMDGOALS)

configure

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+#!/bin/sh
+
+[ -z "$PYTHON" ] && PYTHON=$(which python3 >/dev/null && echo python3 || echo python)
+
+cd $(dirname $0)
+
+srcroot=$(pwd)
+
+if [ ! -f releng/meson/meson.py ]; then
+  git submodule update --init --recursive --depth 1 || exit $?
+fi
+
+cd - >/dev/null
+
+exec "$PYTHON" \
+    -c "import sys; sys.path.insert(0, sys.argv[1]); from releng.meson_configure import main; main()" \
+    "$srcroot" \
+    "$@"

configure.bat

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+@setlocal
+@echo off
+rem:: Based on: https://github.com/microsoft/terminal/issues/217#issuecomment-737594785
+goto :_start_
+
+:set_real_dp0
+set dp0=%~dp0
+set "dp0=%dp0:~0,-1%"
+goto :eof
+
+:_start_
+call :set_real_dp0
+
+if not exist "%dp0%\releng\meson\meson.py" (
+  pushd "%dp0%" & git submodule update --init --recursive --depth 1 & popd
+  if %errorlevel% neq 0 exit /b %errorlevel%
+)
+
+endlocal & goto #_undefined_# 2>nul || title %COMSPEC% & python ^
+    -c "import sys; sys.path.insert(0, sys.argv[1]); from releng.meson_configure import main; main()" ^
+    "%dp0%" ^
+    %*

make.bat

@@ -0,0 +1,23 @@
+@setlocal
+@echo off
+rem:: Based on: https://github.com/microsoft/terminal/issues/217#issuecomment-737594785
+goto :_start_
+
+:set_real_dp0
+set dp0=%~dp0
+set "dp0=%dp0:~0,-1%"
+goto :eof
+
+:_start_
+call :set_real_dp0
+
+if not exist "%dp0%\releng\meson\meson.py" (
+  pushd "%dp0%" & git submodule update --init --recursive --depth 1 & popd
+  if %errorlevel% neq 0 exit /b %errorlevel%
+)
+
+endlocal & goto #_undefined_# 2>nul || title %COMSPEC% & python ^
+    -c "import sys; sys.path.insert(0, sys.argv[1]); from releng.meson_make import main; main()" ^
+    "%dp0%" ^
+    .\build ^
+    %*