[Axl] [PATCH] Fix axl memory helpers

[Benoit Amiaux]

Hello,

Currently, as axl_new is coded as an header define, there is a 
possibility that someone use the library using a different calloc 
implementation that the one compiled with axl. This will trash the 
memory when using axl_free on such pointers.
This is especially true when using axl across dlls.
The solution is to export axl_calloc (that axl_new uses). This ensures that

ref = axl_new(...)
axl_free(ref)

will always work.

Moreover, as vortex is also reallocating some axl pointers, we need to 
export axl_realloc for the same reasons

See attached file for the patch on current trunk

Bye,
AMIAUX Benoit

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