Let CStrings be either 1 or 2 byte aligned. We see a regression on the `tests/assembly/cstring-merging.rs` test on s390x. Some architectures (like s390x) require strings to be 2 byte aligned. Therefor the section name will be marked with a .2 postfix on this architectures. Allowing a section name with a .1 or .2 postfix will make the test pass on either platform.