To support running wrapper scripts use /bin/true in place of app.

This will ignore app's exotic rpath setting but those are not common.
Add options to explicitly specify ACCL and DSPL libGL.
Show ACCL libGL in verbose output.
Direct verbose output to stderr to match libGL.c.
Fail when option is not recognized.
Use script name in error message.
Comment on adding /usr/local/lib to search paths.
Comment on proprietary drivers.
Comment on reporting bugs.