chore(IWYU):Remove redundant includes (#4758)

include/fmt/format-inl.h

@@ -18,10 +18,7 @@ extern "C" void __tsan_release(void*);
 
 #  include <algorithm>
 #  include <cerrno>  // errno
-#  include <climits>
-#  include <cmath>
-#  include <exception>
-#  include <new>  // std::bad_alloc
+#  include <new>     // std::bad_alloc
 #endif
 
 #if defined(_WIN32) && !defined(FMT_USE_WRITE_CONSOLE)

src/os.cc

@@ -13,7 +13,6 @@
 #include "fmt/os.h"
 
 #ifndef FMT_MODULE
-#  include <climits>
 
 #  if FMT_USE_FCNTL
 #    include <sys/stat.h>
@@ -35,6 +34,8 @@
 
 #  ifdef _WIN32
 #    include <windows.h>
+
+#    include <climits>  // CHAR_BIT
 #  endif
 #endif
 

test/format-impl-test.cc

@@ -13,7 +13,6 @@
 
 #include "fmt/format.h"
 #include "gmock/gmock.h"
-#include "util.h"
 
 using fmt::detail::bigint;
 using fmt::detail::fp;

test/posix-mock-test.cc

@@ -15,19 +15,19 @@
 #include <errno.h>
 #include <fcntl.h>
 
-#include <climits>
 #include <memory>
 
 #include "../src/os.cc"
 
 #ifdef _WIN32
 #  include <io.h>
+
+#  include <climits>  // UINT_MAX
 #  undef max
 #endif
 
 #include "gmock/gmock.h"
 #include "gtest-extra.h"
-#include "util.h"
 
 using fmt::buffered_file;