Disable -Wcast-function-type-mismatch

Code owners should fix this.
```
In file included from frameworks/compile/libbcc/lib/Compiler.cpp:38:
In file included from external/llvm/include/llvm/Target/TargetSubtargetInfo.h:18:
...PassCtor' (aka 'ScheduleDAGSDNodes *(*)(SelectionDAGISel *, CodeGenOpt::Level)') to 'MachinePassCtor' (aka 'void *(*)()') converts to incompatible function type [-Werror,-Wcast-function-type-mismatch]
   42 |   : MachinePassRegistryNode(N, D, (MachinePassCtor)C)
```
Bug: b/353528991
Test: m checkbuild

Change-Id: I73607c02d93a3ca3eefe81e1ea2e9e0def6c1aec
1 file changed