Always use full-named o.e.equinox.launcher artifact

For for Mac OS X there was no equinox-launcher fragment for CARBON with
full name, i.e. with <ws>.<os>.<arch> suffix, but only a
org.eclipse.equinox.launcher.carbon.macosx fragment.
But since Eclipse 4.2, released 2012, CARBON is not supported anymore at
all [1]. Therefore the code adjust to that special naming schema, which
also imposed difficulties or new supported architectures on Macos should
be removed.

See also eclipse-equinox/equinox#622

[1] - https://download.eclipse.org/eclipse/updates/4.2/R-4.2-201206081400

bundles/org.eclipse.equinox.p2.publisher.eclipse/src/org/eclipse/equinox/p2/publisher/eclipse/EquinoxExecutableAction.java

@@ -143,9 +143,7 @@ protected boolean publishExecutableIU(ExecutablesDescriptor execDescriptor, IPub
 			String ws = config[0];
 			String os = config[1];
 			String arch = config[2];
-			String launcherFragment = EquinoxLauncherCUAction.ORG_ECLIPSE_EQUINOX_LAUNCHER + '.' + ws + '.' + os;
-			if (!(Constants.OS_MACOSX.equals(os) && !Constants.ARCH_X86_64.equals(arch)))
-				launcherFragment += '.' + arch;
+			String launcherFragment = EquinoxLauncherCUAction.ORG_ECLIPSE_EQUINOX_LAUNCHER + '.' + ws + '.' + os + '.' + arch;
 			iu.setRequirements(new IRequirement[] {MetadataFactory.createRequirement(IInstallableUnit.NAMESPACE_IU_ID, launcherFragment, VersionRange.emptyRange, filter, false, false)});
 		}
 		result.addIU(MetadataFactory.createInstallableUnit(iu), IPublisherResult.ROOT);