Support dynamic assignment of DSBT_INDEX

[Bernd Schmidt]

For DSBT targets (C6X only at this point), we'd like to support the case
where the user did not specify --dsbt-index at link time when building a
shared library. The dynamic linker can still assign an index at runtime
and fix up the DSBT_INDEX relocs, at the cost of startup time and memory
space.

This patch implements it; it requires the previously posted nommu
DT_TEXTREL patch. Ok to install?


Bernd
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