build: process the libxml2 library path for embedding
Process the path for libxml2 before embedding that into the command line
that is generated in `llvm-config`. Each element in the path is being
given a `-l` unconditionally which should not be the case for absolute
paths. Since the library path may be absolute or not, just apply some
CMake pre-processing when generating the path.
Before:
```
/usr/lib/x86_64-linux-gnu/libz.so -lrt -ldl -ltinfo -lpthread -lm /usr/lib/x86_64-linux-gnu/libxml2.so
```
After:
```
/usr/lib/x86_64-linux-gnu/libz.so -lrt -ldl -ltinfo -lpthread -lm -lxml2
```
Resolves PR44179!
GitOrigin-RevId: c3595d1069277b4ab0df49d7139b6f1bbc94f21c
1 file changed
