add glslcc tool

tools/glslcc_build.bat

@@ -0,0 +1,24 @@
+#!/bin/bash 2>nul || goto :windows
+
+# linux + osx -----------------------------------------------------------------
+cd `dirname $0`
+
+git clone https://github.com/septag/glslcc && mkdir glslcc/.build
+cd glslcc/.build
+cmake -B . -DCMAKE_BUILD_TYPE=Release .
+make -j 8
+rem cp -f glslcc/.build/src/Release/glslcc.exe .
+cd ".."
+
+exit
+
+
+:windows -----------------------------------------------------------------------
+@echo off
+cd "%~dp0"
+
+git clone https://github.com/septag/glslcc && md glslcc\.build && pushd glslcc\.build
+cmake .. -B . -DCMAKE_BUILD_TYPE=Release && (make || msbuild glslcc.sln -m -p:Configuration=Release)
+popd
+
+xcopy /y glslcc\.build\src\Release\glslcc.exe