Bug 2156923

Description of problem:
llvm-libunwind-devel should provide libunwind.a.


Version-Release number of selected component (if applicable):
36, 37, rawhide


How reproducible:
Always


Steps to Reproduce:
1. install clang, lld, libcxx-devel, libcxx-static, and llvm-libunwind-devel
2. $ cat <<EOF > /tmp/main.cpp
#include <iostream>
int main() {
  std::cout << "Hello, World!" << std::endl;
  return 0;
}
EOF
3. $ clang++ -std=c++11 -stdlib=libc++ -v -c /tmp/main.cpp -o /tmp/main.o
4. $ clang++ -v -stdlib=libc++ -fuse-ld=lld -unwindlib=libunwind \
    -static-libstdc++ -static-libgcc -rtlib=compiler-rt -L/usr/lib64/llvm-unwind -Wl,--rpath=/usr/lib64/llvm-unwind -o /tmp/main /tmp/main.o

Actual results:
Got the following error.
```
ld.lld: error: unable to find library -l:libunwind.a
ld.lld: error: unable to find library -l:libunwind.a
clang-14: error: linker command failed with exit code 1 (use -v to see invocation)
```

Expected results:
Linking success


Additional info:
The dockerfile below is the ubuntu equivalent of the above steps. (This uses LLVM from apt.llvm.org). This works fine.

```
FROM ubuntu:22.04

RUN apt-get update && \
    apt-get install -y curl ca-certificates lsb-release wget software-properties-common gnupg

RUN curl -L https://apt.llvm.org/llvm.sh -o /tmp/llvm.sh && \
    chmod +x /tmp/llvm.sh && \
    /tmp/llvm.sh 15 all

RUN set -x \
&& { \
  echo '#include <iostream>'; \
  echo 'int main() { std::cout << "Hello, World!" << std::endl; return 0; }'; \
} > /tmp/main.cpp

RUN clang++-15 -std=c++11 -stdlib=libc++ -c /tmp/main.cpp -o /tmp/main.o

RUN clang++-15 -v -stdlib=libc++ -fuse-ld=lld -unwindlib=libunwind \
    -static-libstdc++ -static-libgcc -rtlib=compiler-rt -o /tmp/main /tmp/main.o

RUN ldd /tmp/main && /tmp/main
```