Getting dist-check to work:\

Getting dist-check to work:\
* Implement the FAKE_SOURCES feature for GCCLibraries/crtend \
* Search for distribution files >first< in srcdir and >second< in objdir \
* Make dist-hook only run in top level directory. \
* Make dist-check run correctly in parallel builds \
* Wrap lines to 80 cols \
* Standardize variable names

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18504 91177308-0d34-0410-b5e6-96231b3b80d8