Use some FXSYS methods instead of duplicating

core/fxcrt/include/fx_ext.h

Index: core/fxcrt/include/fx_ext.h
diff --git a/core/fxcrt/include/fx_ext.h b/core/fxcrt/include/fx_ext.h
index d37db67d4ab49d21c8a996d505eb2b8286bc7434..f7aca68d64ea30035bea6a78664f6a5a686110fa 100644
--- a/core/fxcrt/include/fx_ext.h
+++ b/core/fxcrt/include/fx_ext.h
@@ -53,6 +53,9 @@ inline bool FXSYS_iswdigit(wchar_t wch) {
 inline bool FXSYS_iswalnum(wchar_t wch) {
   return FXSYS_iswalpha(wch) || FXSYS_iswdigit(wch);
 }
+inline bool FXSYS_iswspace(FX_WCHAR c) {
+  return (c == 0x20) || (c == 0x0d) || (c == 0x0a) || (c == 0x09);
+}
 
 inline int FXSYS_toHexDigit(const FX_CHAR c) {
   if (!std::isxdigit(c))
@@ -77,6 +80,9 @@ inline int FXSYS_toDecimalDigit(const FX_WCHAR c) {
   return std::iswdigit(c) ? c - L'0' : 0;
 }
 
+FX_FLOAT FXSYS_FractionalScale(size_t scale_factor, int value);
+int FXSYS_FractionalScaleCount();
+
 uint32_t FX_HashCode_GetA(const CFX_ByteStringC& str, bool bIgnoreCase);
 uint32_t FX_HashCode_GetW(const CFX_WideStringC& Str, bool bIgnoreCase);