[PATCH, GDB] Fix Windows gdb build failure with python support

[Thomas Preudhomme]

Hi,

GDB fails to build for Windows host with python support enabled due to
python_file's second argument being of type char * and being passed a
string litteral. This patch takes the conservative assumptions that the
function might indeed modify the character string and use a local char
array to pass the mode instead.

ChangeLog entry is as follows:

*** gdb/ChangeLog ***

2017-04-06  Thomas Preud'homme  <thomas.preudhomme@arm.com>

         * python/python.c (python_run_simple_file): Pass mode as a char
         pointer using local char array.

Testing: build for Windows with python support succeed with this patch and fails 
without.

Is this ok to commit to master?

Best regards,

Thomas
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