Use single shared clang-cpp library starting with LLVM 9 #1171
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Since 9.0 LLVM defaults to building a single clang-cpp library for
non-developer builds.
As this is just the default, and some distributions enable it only with
LLVM 10 (e.g. Fedora), make the clang-cpp search dependent on the build
mode.
Compile tested with openSUSE Tumbleweed (LLVM 10) and Leap 15.2 (LLVM 7).
For some background, see https://fedoraproject.org/wiki/Changes/Stop-Shipping-Individual-Component-Libraries-In-clang-lib-Package and https://llvm.org/docs/CMake.html, option "BUILD_SHARED_LIBS".
Fixes the clang-cpp isssue mentioned in #1155