glsl/linker: Don't include interface name for built-in blocks

Commit 11096ec introduced a regression in some piglit tests (e.g.,
arb_program_interface_query-resource-query).  I did not notice this
regression because other (unrelated) problems caused failed assertions
in those same tests on my system... so they crashed before getting to
the new failure.

v2: Use is_gl_identifier.  Suggested by Tim.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Timothy Arceri <[email protected]>
Cc: [email protected]

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