[bazel] add missing dep after 5b079af

Author: slackito

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

@@ -613,14 +613,15 @@ libc_support_library(
 libc_support_library(
     name = "__support_fixed_point",
     hdrs = [
-        "src/__support/fixed_point/fx_rep.h",
         "src/__support/fixed_point/fx_bits.h",
+        "src/__support/fixed_point/fx_rep.h",
     ],
     deps = [
         ":__support_cpp_bit",
         ":__support_cpp_type_traits",
         ":__support_macros_attributes",
         ":__support_macros_optimization",
+        ":__support_math_extras",
         ":llvm_libc_macros_stdfix_macros",
     ],
 )