[PATCH] malloc: Remove __malloc_initialize_hook from the API [BZ #19564]

[Florian Weimer]

Attached is a slightly more polished version of this patch.  I rebased 
it on current master, so it no longer depends on the patch which removes 
__malloc_check_init.

I still do not know a better way to get rid of the symbol.  This version 
of the patch also makes the symbol a compat symbol.  It turns out the 
preprocessor expansion does the right thing; the symbol name is 
translated before it is converted to a string.

eu-readelf output looks reasonable, no default version:

  1794: 000000000039b790      8 OBJECT  WEAK   DEFAULT       33 
__malloc_initialize_hook@GLIBC_2.2.5


Thanks,
Florian
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