Correct packaging paths
Snapshot version 1.9 release 198
Update compiler fersion information for XL compilers on ostrich.

Text only - no test.

This line, and those below, will be ignored--

M    RELEASE.txt
HDFFV-8933:
Did not provide default values for clang++ options.
Also, applied wrong values for the *_CPPFLAGS.

Solution:
Added default values for *_CXXFLAGS.
Fixed the *_CPPFLAGS values.

Tested: wren with and without --enable-production.
Added instruction to run bin/reconfigure after changes.
HDFFV-8932:
added C++ and High level interface to the default build.

Tested: jam, koala, platypus
merge from trunk.