Linux loader: redirect library functions

_From [qin.zhao@gmail.com](https://code.google.com/u/qin.zhao@gmail.com/) on October 25, 2010 10:48:19_

To support using utility libraries like C++ STL and debug symbol libraries, we should redirect some functions used by those libraries to avoid interfering with application execution, including malloc, calloc, realloc, free, etc..
Other routines may also need to be redirected including:
malloc_usable_size, memalign, valloc, mallinfo, mallopt, etc.
Any other routines?

_Original issue: http://code.google.com/p/dynamorio/issues/detail?id=356_