[BUGFIX] Fix Non-static method tslib_cObj::enableFields()

Non-static method tslib_cObj::enableFields() should
not be called statically

Change-Id: I93497b24618d29534331ac42d87ec2baec91cad6
Resolves: #38602
Releases: 6.1, 6.0
Reviewed-on: https://review.typo3.org/16751
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer
Reviewed-on: https://review.typo3.org/19869
[BUGFIX] Fix Non-static method tslib_cObj::getKey()

Non-static method tslib_cObj::getKey() should
not be called statically

Change-Id: Ic5a8b54db751661a421385bcbccc264e01e958d3
Resolves: #38601
Releases: 6.1, 6.0
Reviewed-on: https://review.typo3.org/16753
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer
Reviewed-on: https://review.typo3.org/19868
Reviewed-by: Stefan Neufeind
[BUGFIX] Fix Non-static method tslib_cObj::calc()

Non-static method tslib_cObj::calc() should
not be called statically

Change-Id: I9d6b5ac1c4e97164af8a3ce0eaaa0fe95c4a6860
Resolves: #38600
Releases: 6.1, 6.0
Reviewed-on: https://review.typo3.org/16754
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Stefan Neufeind
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer
Reviewed-on: https://review.typo3.org/19864