ci: disable PGO on iPhone Simulator builds

We can't run the binaries outside the simulator. PGO might be possible
but I don't want to go down that rabbit hole at the moment.

Author: indygreg

.github/workflows/apple.yml

@@ -152,6 +152,10 @@ jobs:
             optimizations: 'noopt'
           - triple: 'x86_64-apple-ios'
             optimizations: 'noopt'
+          - triple: 'x86_64-apple-ios'
+            optimizations: 'pgo'
+          - triple: 'x86_64-apple-ios'
+            optimizations: 'pgo+lto'
     needs:
       - pythonbuild
       - toolchain