Fix GH-12675: MEMORY_LEAK in phpdbg_prompt.c

Have to use file_put_contents() instead of --FILE-- because we have to
actually load it using the exec command, *and* have to make multiple

Fix GH-12675: MEMORY_LEAK in phpdbg_prompt.c

Have to use file_put_contents() instead of --FILE-- because we have to
actually load it using the exec command, *and* have to make multiple
files, and note that we can only load files relative from the current
directory, so we can't rely on files being in the sapi/phpdbg/tests
folder.

Closes GH-12680.

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