Don't directly include zend_jit_gdb.c

Compile the file separately and only include a header. There doesn't
seem to be a good reason to directly include the C file here, and
this ensu

Don't directly include zend_jit_gdb.c

Compile the file separately and only include a header. There doesn't
seem to be a good reason to directly include the C file here, and
this ensures that there are no symbol clashes (see GH-7197).

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