[cmake] move SONAME handling to llvm_add_library
Summary:
Move handling of the SONAME option from add_llvm_library
to llvm_add_library, so that it can be used in sub-projects.
In particular, this makes it possible to have consistently
named shared libraries for LLVM, Clang and LLDB.
Also, base the SONAME and symlinks on the output name
by extracting the OUTPUT_NAME property, rather than assuming
it is the same as the target name.
Reviewers: beanz
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D14539
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252669
91177308-0d34-0410-b5e6-
96231b3b80d8