glsl2: Move the compiler to the subdirectory it will live in in Mesa.

src/glsl/glcpp/tests/glcpp-test

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+for test in *.c; do
+    echo "Testing $test"
+    ../glcpp < $test > $test.out
+    diff -u $test.expected $test.out
+done