Update to IcedTea 2.4.5 (u51b31)
- Switch to individual repository tarballs
- Fix source file numbering
- Drop upstreamed PPC build patches and broken Zero workaround
- Drop unneeded Mercurial & redhat-lsb dependencies.  Add hostname.
- Add NSS dependency so config file is correctly written.
- Temporary workaround to get PPC building again by pre-building HotSpot.
- Fix typo (java-abrt-luncher->java-abrt-launcher)
- resolves rhbz#910107
- Rename JDK_BUILD_NUMBER to BUILD_NUMBER as in IcedTea.
- Add JRE_RELEASE_VERSION and ALT_PARALLEL_COMPILE_JOBS from IcedTea.
- Get FT2_{CFLAGS,LIBS} from pkg-config.