reserved identifier violation

[elfring]

I would like to point out that identifiers like “_STRING_BUILDER_H_” and “_VMCODE_H_” do not fit to the expected naming convention of the C language standard.
Would you like to adjust your selection for unique names?

[eriknyquist]

interesting, had not heard of that. Thanks for the recommendation

[eriknyquist]

fixed
8f04d21

[elfring]

Thanks for your adjustment of affected include guards.

I would appreciate if these identifiers will not only become standard compliant but also safe for reuse.