Allow repair to use strip with --strip-debug instead of only allowing --strip-all

[raulcd]

Auditwheels allowed the ability to strip symbols on:

• Add --strip option to 'repair' #255

When we use the --strip option:

auditwheel/src/auditwheel/main_repair.py

Lines 81 to 87 in d6e5b69

	p.add_argument(
	"--strip",
	dest="STRIP",
	action="store_true",
	help="Strip symbols in the resulting wheel",
	default=False,
	)

The option used today is to execute strip -s, see:

auditwheel/src/auditwheel/repair.py

Line 127 in d6e5b69

check_call(["strip", "-s", lib])

We have been doing some debugging on the Apache Arrow project and we would like to use the option to strip only debug symbols in order to preserve the full backtrace including non-public functions when debugging and still be able to reduce the size of our wheels, see more information here: apache/arrow#40749 (comment)

I would like to have the ability to pass the --strip-debug to strip. I am happy to create a PR if you think this is ok to be done.