[libc] fix MPFR rounding problems in fuzz test

The accuracy for the MPFR numbers in the strtofloat fuzz test was set
too high, causing rounding issues when rounding to a smaller final
result.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D154150

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

@@ -42,6 +42,7 @@ cc_library(
         "//libc:__support_cpp_string",
         "//libc:__support_cpp_string_view",
         "//libc:__support_cpp_type_traits",
+        "//libc:__support_fputil_float_properties",
         "//libc:__support_fputil_fp_bits",
         "//libc:__support_fputil_fpbits_str",
         "//libc:__support_fputil_platform_defs",