Fix R 3.3.0-3.3.2 builds

[gaborcsardi]

Closes #178.

[glin]

Nice! We've had this around forever and can finally remove the caveat note from the docs.

Just one more thing, handler.py will need to be updated to not skip these builds anymore:

r-builds/handler.py

Lines 149 to 154 in b541a8f

	# In R 3.3.0, 3.3.1, and 3.3.2, the configure script check for the
	# zlib version fails to handle versions longer than 5 characters.
	# Skip builds affected by this bug. Most newer distros will be affected.
	# https://github.com/rstudio/r-builds/issues/76
	if version in ['3.3.0', '3.3.1', '3.3.2'] and platform not in ['centos-7']:
	continue

This should also close #76 and #36

[glin]

Based on previous notes, CentOS 7 was supposedly unaffected, and I do see an installer up at https://cdn.rstudio.com/r/centos-7/pkgs/R-3.3.0-1-1.x86_64.rpm

[gaborcsardi]

Oh, OK. OTOH, it also does not hurt to do it for CentOS 7 as well, and then it is simpler if we do it everywhere.

[glin]

Sure, that's a fine reason to keep it in then.

[gaborcsardi]

OK, I updated handler.py hopefully it is OK now.

Let me know if you want to remove the patch from CentOS 7. I think it is better to keep it, one less special case. I did try the build with the patch on CentOS 7 (in the arm64 builds) and it works fine.