sys/cbprintf: Limit C++ rvalue references to compatible standards
This feature didn't appear until C++11, so don't expose our wrapper
for it in C++98.
Signed-off-by: 
Andy Ross <andyross@google.com>
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This feature didn't appear until C++11, so don't expose our wrapper
for it in C++98.
Signed-off-by: Andy Ross <andyross@google.com>