* configure.ac: Add RTEMS_ENABLE_RPMPREFIX. Add RTEMSRPMPREFIX. * common/rtems.texi.in: Add RTEMSRPMPREFIX.
* acinclude.m4: New. * common/rtems.texi.in: New. * configure.ac: Reflect changes above. * project.am: Add COMMON_FILES. Add rules to build common/rtems.texi.