So I did another experiment...

I've built libc with an intermediate step that uses `objcopy
--localize-symbols' to bind internal references directly and remove
symbols from the exported symbol table.  This significantly reduces
the number of symbol-relative relocations; in fact, with the 806
symbols I elided, it reduces the number of such relocations from 917
to 380.

This corresponds to about a 16.1% improvement in the simple-exec-loop
test case, making the dynamic version about 4.3x slower than than the
static version.

The 806 symbols I removed are mostly internal DB functions and symbols
that are renamed in namespace.h so they will intentionally use the
libc versions.  None of these are supposed to be used by other code
anyway.

I haven't yet checked in libc/Makefile changes to do this; I thought I
would solicit comments here first...

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_CurrentMessagesLocale   
_CurrentMonetaryLocale   
_CurrentNumericLocale    
_CurrentRuneLocale       
_CurrentTimeLocale       
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_Read_RuneMagi
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___runetype_mb
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_dns_getnetbyname        
_drand48
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