This is because they are incompatible with C++ and possibly other
languages that make them minimum size 1 (to make sure multiple
such objects don't reside at the same address). Forcing them to size
1 was also not practical, as that is requires updating the logic
of a lot of implementations and thus possibly backwards incompatible.
More here: https://github.com/google/flatbuffers/issues/4122
Change-Id: I2bfdc8597b7cfd2235bb4074bb2ae06f81f8e57d
Changing to keep include prefixes had two side effects: the main
file being parsed wasn't filtered out anymore, and include directory
paths would be added to the path in the include statement.
Also moved the include_test*.fbs files to sub directories so we
can actually test the handling of -I etc.
tested: on Linux.
Change-Id: Ibae095cea7ab0cccbac15cfb5171719f6b5cad8c