Make the library name LLVMsystem instead of just system so as to not
to be confused with other "system" libraries.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16049 91177308-0d34-0410-b5e6-96231b3b80d8
and a list of don'ts for the library. All so future maintainers don't
break the important contract this library has with its user: LLVM.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14979 91177308-0d34-0410-b5e6-96231b3b80d8