Be ANSI-C compliant when defining CX_LIMITED_RANGE #pragma

This mutes warnings with clang

Approved by: rpaulo (mentor)
Reviewed by: das, kargl (both as part of a larger patch)
Phabric: D742
Sponsored by: EMC / Isilon Storage Division


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271296 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f