When building the __doc__ string for Fortran objects, the ')'
character, closing the dimensions list, is written 1 position
beyond the allowed buffer size, instead of the current pointer in
the buffer.

A missing call to rmbadname1 in analyzecommon caused a look up of
common block variables with a name in the badnames list to fail
and the fall back of defaultimplicitrules to be used.
See ticket 9228.

Since we only need to support python 2, we can remove any case where we just
pass a single string literal and use the b prefix instead.

What we can't do is transform asbytes("tests %d" % num), because %-formatting
fails on bytes in python 3.x < 3.5.

Fix Fortran kind detection for PPC64el.

See: gh-3424.

per request from @charris