Both clang and gcc development branches have reached version 10. Since we
only parse for a single digit in the major version number, this causes
COMPILER_VERSION to be set to its default of 0.0.0, meaning version checks
fail with these newer compilers.

Reviewed by:	emaste
Approved by:	markj (mentor)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D21413