Expand tests for testing the rust-target flag generated by builder.

Author: manaskarekar

src/lib.rs

@@ -1899,6 +1899,7 @@ fn commandline_flag_unit_test_function() {
     let command_line_flags = bindings.command_line_flags();
 
     let test_cases = vec![
+        "--rust-target",
         "--no-derive-default",
         "--generate",
         "function,types,vars,methods,constructors,destructors",
@@ -1918,6 +1919,7 @@ fn commandline_flag_unit_test_function() {
 
     let command_line_flags = bindings.command_line_flags();
     let test_cases = vec![
+        "--rust-target",
         "input_header",
         "--no-derive-default",
         "--generate",