Fixed realpath issue

[SantoshNC68]

Fixed issue while using realpath in some environments. Now using readlink and realpath both, whichever is applicable it will try to use that instead.

Applicable Issues

Description of the Change

In some environments, /usr/bin doesn't contain the realpath, so used the readlink whichever machine doesn't contain the realpath will try to use the readlink instead or whichever is applicable first.

Alternate Designs

Benefits

Possible Drawbacks

Sign-off

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Signed-off-by:

[tobiasake]

Need to be tested in Windows (gitbash or what windows user is using) before merge.