[libc][Obvious] Mark functions in DummyFEnv.h as static inline.

GitOrigin-RevId: b266c818e7cb30464a7bb9e5f8241375ac1722b1
diff --git a/utils/FPUtil/DummyFEnv.h b/utils/FPUtil/DummyFEnv.h
index 4f4c2c0..19c661f 100644
--- a/utils/FPUtil/DummyFEnv.h
+++ b/utils/FPUtil/DummyFEnv.h
@@ -17,15 +17,15 @@
 
 // All dummy functions silently succeed.
 
-int clearExcept(int) { return 0; }
+static inline int clearExcept(int) { return 0; }
 
-int testExcept(int) { return 0; }
+static inline int testExcept(int) { return 0; }
 
-int raiseExcept(int) { return 0; }
+static inline int raiseExcept(int) { return 0; }
 
-int getRound() { return FE_TONEAREST; }
+static inline int getRound() { return FE_TONEAREST; }
 
-int setRound(int) { return 0; }
+static inline int setRound(int) { return 0; }
 
 } // namespace fputil
 } // namespace __llvm_libc