Use SRC_LOCAL_PATH as single source of truth

[matzipan]

This avoids the two path diverging and possibly causing problems in the future

Describe the contribution
The call to file(TO_NATIVE_PATH ...) is building its own path even though its contents are identical to SRC_LOCAL_PATH. This change avoids possible divergence of these values in the future.

Testing performed
Ran a local build.

Expected behavior changes
No change in behavior.

[jphickey]

Looks good to me

[stanislaw]

Please note, that PTS GmbH has signed the corporate CLA document on Feb 17th and it has been sent to the GSFC-SoftwareRelease email. @matzipan is on the list so this PR should no longer be pending CLA.

cc @skliper

[skliper]

CLA confirmed, this pull request can proceed.

[astrogeco]

@matzipan and @stanislaw please update the the title of your pull requests and your commits to use the following format:

Fix #ISSUE_NUMBER, Description

see other pull requests and commits in repository as an example.

[astrogeco]

CCB 20200311 - Approved

[matzipan]

Apologies for not having time to change the title format to Fix #ISSUE_NUMBER, Description. I'm guessing it might be a bit late now.

[astrogeco]

Apologies for not having time to change the title format to Fix #ISSUE_NUMBER, Description. I'm guessing it might be a bit late now.

No worries. We don't have a contribution guide up so you had no way to know in advance. In the future please open an issue and then the pull request to address it; this helps us build our version description document when we do our next release.