BUG: Remove ENABLED_SHARED option for IOSpatialObjects module

revert commit e55e67b7757ed07757d0fae5e6b657953e382cbb for
IOSpactialObjects directory. The SpatialObjects module depends on module
IOXML and ITKSpatialObjecs this is creating symbol confusion on some
platform causing valgrind defects and test failures.

Change-Id: I7cc3b430985c68ffcf774e88b35739886541a187
Merge topic 'RemoveENALBESHAREDIOSpatialObjects'

2382b66 BUG: Remove ENABLED_SHARED option for IOSpatialObjects module
COMP: Fix invalid Doxygen LaTeX formula.

Change-Id: Ic4b78a0aab86be0d868401070c25c693e11621d0
Merge topic 'LaTeXFormula'

3a6ac58 COMP: Fix invalid Doxygen LaTeX formula.