sidmiscutil.h: sid_find_data_file

[Frank Ch. Eigler]

Hi -

I just committed a little helper function into sidmiscutil.h
to provide a standard search path for sid-related file names.
It allows things like sid configuration file names, ROM image
file names, tcl scripts, to be referenced without the fully
qualified path name.  The function looks under the install
tree, as specified by compiled-in defaults, and as possibly
overriden by $SID_EXEC_PREFIX and $SID_LIBRARY_PATH.  Enjoy.

- FChE
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