[libc][math][c23] Change BUILD define.

Author: harrisonGPU

utils/bazel/llvm-project-overlay/libc/BUILD.bazel

@@ -2826,7 +2826,12 @@ libc_math_function(name = "floorf16")
 
 # TODO: Add fma, fmaf, fmal, fmaf128 functions.
 
-libc_math_function(name = "fmaf16")
+libc_math_function(
+    name = "fmaf16",
+    additional_deps = [
+        ":__support_fputil_fma",
+    ],
+)
 
 libc_math_function(name = "fmax")