glsl: rewrite glsl_type::record_key_hash() to avoid buffer overflow

This should be more efficient than the previous snprintf() solution.
But more importantly, it avoids a buffer overflow bug that could result
in crashes or unpredictable results when processing very large interface
blocks.

For the app in question, key->length = 103 for some interfaces.  The check
if size >= sizeof(hash_key) was insufficient to prevent overflows of the
hash_key[128] array because it didn't account for the terminating zero.
In this case, this caused the call to hash_table_string_hash() to return
different results for identical inputs, and then shader linking failed.

This new solution also takes all structure fields into account instead
of just the first 15 when sizeof(pointer)==8.

Cc: [email protected]
Reviewed-by: Ian Romanick <[email protected]>
(cherry picked from commit 31667e6237d30188d0b29e17f5b9892f10c0d83a)

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