Don't create .pyc files for the main script

I don't know what the reason is, but it's tripping up cffi's test suite.

src/jit.cpp

@@ -509,7 +509,7 @@ static int main(int argc, char** argv) noexcept {
                 free(real_path);
 
                 try {
-                    AST_Module* ast = caching_parse_file(fn, /* future_flags = */ 0);
+                    AST_Module* ast = parse_file(fn, /* future_flags = */ 0);
                     compileAndRunModule(ast, main_module);
                     rtncode = 0;
                 } catch (ExcInfo e) {

test/tests/no_pyc_check.py

+import os.path
+try:
+    assert not os.path.exists(__file__ + 'c')
+except AssertionError:
+    os.unlink(__file__ + 'c')
+    raise