Micah Snyder da23b1ceab CMake: Fix support for external LLVM (3.6) ...

Have to manually link libtinfo (`-ltinfo`) because our FindLLVM
didn't add it to the LLVM_LIBRARIES variable for us. See:
- https://stackoverflow.com/questions/21477407/llvm-3-5-fails-to-link

Have to remove the CXX_STANDARD setting at the top of CMakeLists.txt
because of c++90 / c++11 ABI compatibility issues w/ LLVM. See:
- https://maleadt.github.io/LLVM.jl/dev/man/troubleshooting/

Rename "llvm/Config/config.h" "llvm/Config/llvm-config.h" because
LLVM renamed it in 2.8.

Have to link LLVM manually with the test binaries that use the
clamav object library instead of libclamav shared library.
CMake does not propagate library dependencies from object files.

I tested on ubuntu:16.04 with LLVM 3.6 built from source using:
```
/usr/local/bin/cmake .. -D CMAKE_INSTALL_PREFIX=/opt/llvm/3.6 \
  -D LLVM_ENABLE_RTTI=ON
```
Then built clamav w/:
```
/usr/local/bin/cmake .. -D CMAKE_INSTALL_PREFIX=`pwd`/install \
  -D BYTECODE_RUNTIME="llvm" \
  -D LLVM_ROOT_DIR="/opt/llvm/3.6" \
  -D LLVM_FIND_VERSION="3.6.0" && make && make install
```

2021-05-19 14:20:59 -07:00

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