• Switch to USES+=compiler:c++11-lang to unbreak on PowerPC instead of the approach taken in r513793 (Clang was never required for this port, any not-so-ancient compiler would suffice)
• Sort the values on the USES list; avoid hardcoding version numbers
• Pluralize the noun in the COMMENT line and make it a bit shorter

Reviewed by: pkubaj
PR: 239181