build with -O2

wscript

@@ -24,7 +24,7 @@ def build(bld):
         source = bld.path.ant_glob(["src/**/*.cc", "src/**/*.c", "libs/glcxx/src/glcxx/*"]),
         includes = includes,
         defines = ['GLCXX_GL_INCLUDE="gl3w.h"'] + defines,
-        cxxflags = ["-Wall", "-std=gnu++14"],
+        cxxflags = ["-Wall", "-std=gnu++14", "-O2"],
         lib = ["dl", "GL"],
         uselib = ["SDL2", "FreeType2"])