Remove special treatment of org.eclipse.swt in API-Tools

[HannesWell]

At the moment API-tools have special treatment for the org.eclipse.swt project, because within the IDE the java class reside within the o.e.swt (host/main) bundle, while in the baseline the classes reside within the platform specific fragments:

eclipse.pde/apitools/org.eclipse.pde.api.tools/src/org/eclipse/pde/api/tools/internal/util/Util.java

Line 308 in b95c6e5

public static final String ORG_ECLIPSE_SWT = "org.eclipse.swt"; //$NON-NLS-1$

eclipse-platform/eclipse.platform.swt#1008 this could change and we can probably remove the special handling for swt in api-tools.

See also #1073 (comment) (although this missed some parts).