[libc] [test] Add missing <cstdint> include

[thesamesam]

Summary

Fixes build w/ GCC 13:

[587/7274] Building CXX object projects/libc/test/src/__support/CMakeFiles/libc_system_str_to_float_comparison_test.dir/str_to_float_comparison_test.cpp.o
FAILED: projects/libc/test/src/__support/CMakeFiles/libc_system_str_to_float_comparison_test.dir/str_to_float_comparison_test.cpp.o
/usr/lib/llvm/16/bin/clang++ -D_DEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/sam/git/llvm-project/build/projects/libc/test/src/__support -I/home/sam/git/llvm-project/libc/test/src/__support -I/home/sam/git/llvm-project/build/include -I/home/sam/git/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -std=c++17 -MD -MT projects/libc/test/src/__support/CMakeFiles/libc_system_str_to_float_comparison_test.dir/str_to_float_comparison_test.cpp.o -MF projects/libc/test/src/__support/CMakeFiles/libc_system_str_to_float_comparison_test.dir/str_to_float_comparison_test.cpp.o.d -o projects/libc/test/src/__support/CMakeFiles/libc_system_str_to_float_comparison_test.dir/str_to_float_comparison_test.cpp.o -c /home/sam/git/llvm-project/libc/test/src/__support/str_to_float_comparison_test.cpp
/home/sam/git/llvm-project/libc/test/src/__support/str_to_float_comparison_test.cpp:34:15: error: unknown type name 'uint32_t'
static inline uint32_t hexCharToU32(char in) {
              ^
/home/sam/git/llvm-project/libc/test/src/__support/str_to_float_comparison_test.cpp:39:15: error: unknown type name 'uint32_t'
static inline uint32_t fastHexToU32(const char *inStr) {
              ^

[michaelrj]

LGTM

[thesamesam]

Thanks!

libc/test/src/__support/str_to_float_comparison_test.cpp

 //===-- strtofloatingpoint comparison test --------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // #include "src/__support/str_float_conv_utils.h"
 
 #include <stdlib.h>
 
 // #include "src/__support/FPUtil/FPBits.h"
 
+#include <cstdint>
 #include <fstream>
 #include <iostream>
 #include <string>
 
 // The intent of this test is to read in files in the format used in this test
 // dataset: https://github.com/nigeltao/parse-number-fxx-test-data
 // The format is as follows:
 // Hexadecimal representations of IEEE754 floats in 16 bits, 32 bits, and 64