Resolve or silence some warnings (#1905)

* Resolve some warnings

- Their frequent appearance in the build logs is driving me nuts

* Silence warnings about `offsetof`

* Don't apply `-Wno-invalid-offset` to C, only to C++

1 files changed, 2 insertions, 0 deletions

diff --git a/src/SPU.cpp b/src/SPU.cpp
index f0d5946..8630709 100644
--- a/src/SPU.cpp
+++ b/src/SPU.cpp
@@ -621,6 +621,8 @@ s32 SPUChannel::Run()
                    (PrevSample[0] * InterpCubic[samplepos][2]) +
                    (val           * InterpCubic[samplepos][3])) >> 14;
             break;
+        default:
+            break;
         }
     }