[libc++] Remove _LIBCPP_USING_IF_EXISTS from fundamental aliases

Author: philnik777

libcxx/include/cstddef

@@ -56,8 +56,8 @@ Types:
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 using ::nullptr_t;
-using ::ptrdiff_t _LIBCPP_USING_IF_EXISTS;
-using ::size_t _LIBCPP_USING_IF_EXISTS;
+using ::ptrdiff_t;
+using ::size_t;
 
 #if !defined(_LIBCPP_CXX03_LANG)
 using ::max_align_t _LIBCPP_USING_IF_EXISTS;

libcxx/include/cstdint

@@ -158,15 +158,15 @@ Types:
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-using ::int8_t _LIBCPP_USING_IF_EXISTS;
-using ::int16_t _LIBCPP_USING_IF_EXISTS;
-using ::int32_t _LIBCPP_USING_IF_EXISTS;
-using ::int64_t _LIBCPP_USING_IF_EXISTS;
-
-using ::uint8_t _LIBCPP_USING_IF_EXISTS;
-using ::uint16_t _LIBCPP_USING_IF_EXISTS;
-using ::uint32_t _LIBCPP_USING_IF_EXISTS;
-using ::uint64_t _LIBCPP_USING_IF_EXISTS;
+using ::int8_t;
+using ::int16_t;
+using ::int32_t;
+using ::int64_t;
+
+using ::uint8_t;
+using ::uint16_t;
+using ::uint32_t;
+using ::uint64_t;
 
 using ::int_least8_t _LIBCPP_USING_IF_EXISTS;
 using ::int_least16_t _LIBCPP_USING_IF_EXISTS;

libcxx/include/cstdio

@@ -115,7 +115,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 using ::FILE _LIBCPP_USING_IF_EXISTS;
 using ::fpos_t _LIBCPP_USING_IF_EXISTS;
-using ::size_t _LIBCPP_USING_IF_EXISTS;
+using ::size_t;
 
 using ::fclose _LIBCPP_USING_IF_EXISTS;
 using ::fflush _LIBCPP_USING_IF_EXISTS;

libcxx/include/cstdlib

@@ -99,7 +99,7 @@ void *aligned_alloc(size_t alignment, size_t size);                       // C11
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-using ::size_t _LIBCPP_USING_IF_EXISTS;
+using ::size_t;
 using ::div_t _LIBCPP_USING_IF_EXISTS;
 using ::ldiv_t _LIBCPP_USING_IF_EXISTS;
 using ::lldiv_t _LIBCPP_USING_IF_EXISTS;

libcxx/include/cstring

@@ -75,7 +75,7 @@ size_t strlen(const char* s);
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-using ::size_t _LIBCPP_USING_IF_EXISTS;
+using ::size_t;
 using ::memcpy _LIBCPP_USING_IF_EXISTS;
 using ::memmove _LIBCPP_USING_IF_EXISTS;
 using ::strcpy _LIBCPP_USING_IF_EXISTS;

libcxx/include/ctime

@@ -62,7 +62,7 @@ int timespec_get( struct timespec *ts, int base); // C++17
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 using ::clock_t _LIBCPP_USING_IF_EXISTS;
-using ::size_t _LIBCPP_USING_IF_EXISTS;
+using ::size_t;
 using ::time_t _LIBCPP_USING_IF_EXISTS;
 using ::tm _LIBCPP_USING_IF_EXISTS;
 #if _LIBCPP_STD_VER >= 17

libcxx/include/cuchar

@@ -57,7 +57,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 #if !defined(_LIBCPP_CXX03_LANG)
 
 using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
-using ::size_t _LIBCPP_USING_IF_EXISTS;
+using ::size_t;
 
 #  if !defined(_LIBCPP_HAS_NO_C8RTOMB_MBRTOC8)
 using ::mbrtoc8 _LIBCPP_USING_IF_EXISTS;

libcxx/include/cwchar

@@ -127,7 +127,7 @@ size_t wcsrtombs(char* restrict dst, const wchar_t** restrict src, size_t len,
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
-using ::size_t _LIBCPP_USING_IF_EXISTS;
+using ::size_t;
 using ::tm _LIBCPP_USING_IF_EXISTS;
 using ::wint_t _LIBCPP_USING_IF_EXISTS;
 using ::FILE _LIBCPP_USING_IF_EXISTS;