Test cmake imprv

[ZuseZ4]

I remove the branching to see if we can handle static and dynamic llvm builds together. If it passes CI, I'll remove the custom code from the Rust fork.

[ZuseZ4]

@wsmoses

[100%] Linking CXX shared library libEnzyme-15.dylib
Undefined symbols for architecture x86_64:
  "_compress2", referenced from:
      llvm::compression::zlib::compress(llvm::ArrayRef<unsigned char>, llvm::SmallVectorImpl<unsigned char>&, int) in libLLVMSupport.a[38](Compression.cpp.o)
  "_compressBound", referenced from:
      llvm::compression::zlib::compress(llvm::ArrayRef<unsigned char>, llvm::SmallVectorImpl<unsigned char>&, int) in libLLVMSupport.a[38](Compression.cpp.o)
  "_crc32", referenced from:
      llvm::crc32(unsigned int, llvm::ArrayRef<unsigned char>) in libLLVMSupport.a[39](CRC.cpp.o)
      llvm::crc32(llvm::ArrayRef<unsigned char>) in libLLVMSupport.a[39](CRC.cpp.o)
      llvm::JamCRC::update(llvm::ArrayRef<unsigned char>) in libLLVMSupport.a[39](CRC.cpp.o)
  "_uncompress", referenced from:
      llvm::compression::zlib::uncompress(llvm::ArrayRef<unsigned char>, unsigned char*, unsigned long&) in libLLVMSupport.a[38](Compression.cpp.o)
      llvm::compression::zlib::uncompress(llvm::ArrayRef<unsigned char>, llvm::SmallVectorImpl<unsigned char>&, unsigned long) in libLLVMSupport.a[38](Compression.cpp.o)
ld: symbol(s) not found for architecture x86_64

[wsmoses]

this has a much larger code change than just the cmake, can you make this just the cmake?