Apple: suppress Xcode 12 ranlib warning

The Xcode 12 (Beta) toolchain for arm64 emits a warning when static
libraries are created:

```
ranlib: archive member: libStaticLib.a(a.c.o) offset in archive not a multiple of 8 (must be since member is an 64-bit object file)
```

Due to the unexpected output multiple tests are broken. To make those
tests pass we filter the problematic output in the test driver.

See: https://developer.apple.com/forums/thread/652620

Tests/RunCMake/RunCMake.cmake

@@ -154,6 +154,7 @@ function(run_cmake test)
 
     "|[^\n]*xcodebuild[^\n]*warning: file type[^\n]*is based on missing file type"
     "|[^\n]*is a member of multiple groups"
+    "|[^\n]*offset in archive not a multiple of 8"
     "|[^\n]*from Time Machine by path"
     "|[^\n]*Bullseye Testing Technology"
     ")[^\n]*\n)+"