[R-SIG-Mac] vecLib-based BLAS not working with R 4.5.0

[Ulrich KELLER]

Symlinking the vecLib-based BLAS no longer seems to work with R 4.5.0. After running `ln -sf libRblas.vecLib.dylib libRblas.dylib`, R fails to load the stats package:

```
During startup - Warning message:
package ‘stats’ in options("defaultPackages") was not found
> library(stats)
Error: package or namespace load failed for ‘stats’ in dyn.load(file, DLLpath = DLLpath, ...):
 unable to load shared object '/Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library/stats/libs/stats.so':
  dlopen(/Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library/stats/libs/stats.so, 0x0006): Symbol not found: _dgemmtr_
  Referenced from: <28799065-89DC-362D-9F05-042D50E7824C> /Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/lib/libRlapack.dylib
  Expected in:     <BA0E9688-AFD2-34E6-A54F-3B08D084074A> /Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/lib/libRblas.vecLib.dylib
```

Switching back to the default BLAS fixes the problem. In R 4.4.3, which I also still have installed through rig, the vecLib BLAS works fine.