cdef: Add a CDEF_ prefix to the HAVE_LEFT etc enum values

This reduces potential ambiguity across the codebase, as the enum
is CDEF specific, and there is another similar enum for loop restoration.

Alternatively an independent enum could be used for both CDEF and loop
restoration.
18 jobs for master in 8 minutes and 21 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Style
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style-check

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  Build
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build-debian

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build-win-arm64

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win32
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  Test
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test-debian

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