In platforms with bounds-checking enabled, placeholder values for array sizes in structs that may be exceeded always result in a sigtrap.
This patch updates the following classes to use flexible arrays at the end of structs:
- database
- Label
- PropertyRecord (union of three flexible arrays and a pointer*)
- cellUE
- extflat
- HierName
- EFAttr
- Dev
- utils
- HashEntry (union of two flexible arrays and a pointer*)
- internalUndoEvent: Was a plain int, replaced with a flexible char array
Additionally, the database struct editUE, which would have just a single flexible-array member, was removed and simply replaced with a character pointer.
Where possible, allocation size macros have been introduced.
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* It is noted flexible-length arrays as part of unions are not part of the C language spec and are a GNU99 extension, however, it is supported by both GCC and Clang.
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