Making these changes seems to cause chplglob.h to compile with CCE again

I also took a stab at simplifying chpldirent.h, but can't tell yet
whether it's working or not.
This is a first stab at building re2 speculatively and by default

The main problem is that when it succeeds, the Makefiles still
think that CHPL_MAKE_RE2 is none, I believe.
Believe I got the speculative build of re2 working
Merge branch 'master' of https://github.com/chapel-lang/chapel into fix-glob-for-cce
Getting this commented and ready for committing
Backing out the changes to this file for now

I want to test the changes one at a time.
Merge pull request #410 from bradcray/fix-glob-for-cce

Fix glob for CCE

[approved by @mppf]

This commit comments out the #define of _FILE_OFFSET_BITS from
sys_basic.h because it has been causing portability issues for
various file-related routines like dirent.h and glob.h.  The
latest issue is that an #include of glob.h for the Cray CCE
compiler breaks compilation.  I think this was also the cause
of the complexity in chpldirent.h that I inserted to get it
compiling in all Cray configurations (and future work should
try backing out those changes; but I wanted to take things
one step at a time).

Michael was worried that this would break 32-bit builds, but I'm not
seeing that.  As I understand it, his original rationale for this was
to guarantee support for files larger than 4GB.  If/when we get to
needing that, we can reconsider this change.
Merge branch 're2ByDefault' of https://github.com/bradcray/chapel
Trying a single Makefile approach to making re2 by default