struct packed: Unit tests and more operators

For PR gdb/29373, I wrote an alternative implementation of struct
packed that uses a gdb_byte array for internal representation, needed
for mingw+clang.  While adding that, I wrote some unit tests to make
sure both implementations behave the same.  While at it, I implemented
all relational operators.  This commit adds said unit tests and
relational operators.  The alternative gdb_byte array implementation
will come next.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29373

Change-Id: I023315ee03622c59c397bf4affc0b68179c32374

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