switch build system to rscons v2.0.0

Rsconscript

@@ -0,0 +1,21 @@
+configure do
+  check_cxx_compiler
+  check_program "flex"
+  check_program "bison"
+  check_lib ":libfl.a"
+  check_lib "pthread"
+  check_lib "freeimage"
+end
+
+build do
+  Environment.new do |env|
+    subdirs = %w[util shapes main distrib parser]
+    env["CCFLAGS"] += %w[-Wall -O2]
+    env["CPPPATH"] += %w[.] + subdirs + ["#{env.build_root}/parser"]
+    sources = glob("{#{subdirs.join(",")}}/*.cc")
+    sources += ["^/parser/lexer.cc", "^/parser/parser.cc"]
+    env.CFile("^/parser/lexer.cc", "parser/parser.ll")
+    env.CFile("^/parser/parser.cc", "parser/parser.yy")
+    env.Program("fart", sources)
+  end
+end