Use ant-opencms.jar instead ant-opencms-1.2.jar

This change is necessary after applying the patchs
https://github.com/gallardo/opencms-core/tree/patch-2 and
https://github.com/gallardo/opencms-core/tree/patch-3 to opencms-core.

Conflicts:
	alkacon.properties
	build-single.xml
	build.xml
Merge branch 'patch-8'

Conflicts:
	build-single.xml