[libc][obvious] Fix fdim[f|l] signatures in stdc spec.

GitOrigin-RevId: ad0e764ead36d5ed87015ea7aa8ba033117b7477
diff --git a/spec/stdc.td b/spec/stdc.td
index 7f70e17..854566c 100644
--- a/spec/stdc.td
+++ b/spec/stdc.td
@@ -258,9 +258,9 @@
           FunctionSpec<"fabsf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
           FunctionSpec<"fabsl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
 
-          FunctionSpec<"fdim", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
-          FunctionSpec<"fdimf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
-          FunctionSpec<"fdiml", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
+          FunctionSpec<"fdim", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<DoubleType>]>,
+          FunctionSpec<"fdimf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<FloatType>]>,
+          FunctionSpec<"fdiml", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>, ArgSpec<LongDoubleType>]>,
 
           FunctionSpec<"floor", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
           FunctionSpec<"floorf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,