Workaround potential C-API `FILE` incompatibility by reading the
file data into memory, compiling & running it - matching existing logic
for text buffers text buffers. This replaces the in-lined stub-script
that re-opened the file from Python.
While the down-side of the stub-script was minor, it required some
non-obvious logic and had the disadvantage of requiring 2x scripts to
execute whenever a file was executed on WIN32.
Expose BLI_file_read_data_as_mem_from_handle as a public function
since it's useful to be able to read an existing FILE into memory.
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