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short-description: Add c17 and c18 values for c_std option
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## Added c17 and c18 as c_std values for recent GCC and Clang Versions

For gcc version 8.0 and later, the values c17, c18, gnu17, and gnu18 were added to the accepted values for built-in compiler option c_std.

For Clang version 10.0 and later on Apple OSX (Darwin), and for version 7.0 and later on other platforms, the values c17 and gnu17 were added as c_std values.
