util/hash_table: don't compare deleted entries
util/hash_table: don't compare deleted entries

The equivalent of the last patch for the hash table. I'm not aware of
any issues this fixes.

v2:
- use entry_is_deleted (Timothy)

Reviewed-by: Timothy Arceri <5dd83789ef3714029244367ba1ca09f1d7627408@collabora.com>
Signed-off-by: Connor Abbott <71178acffcc112b21e5858656e5751f5e4aa9364@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler