Remove FX_DWORD from core/ and delete definition

core/fxcrt/fxcrt_posix.cpp

Index: core/fxcrt/fxcrt_posix.cpp
diff --git a/core/fxcrt/fxcrt_posix.cpp b/core/fxcrt/fxcrt_posix.cpp
index 02556c152078e35b4fa9ba85f818ce6ad48ad7b9..2f17e71567c70dea87bf664e08f367c1b99c1430 100644
--- a/core/fxcrt/fxcrt_posix.cpp
+++ b/core/fxcrt/fxcrt_posix.cpp
@@ -14,7 +14,7 @@
 IFXCRT_FileAccess* FXCRT_FileAccess_Create() {
   return new CFXCRT_FileAccess_Posix;
 }
-void FXCRT_Posix_GetFileMode(FX_DWORD dwModes,
+void FXCRT_Posix_GetFileMode(uint32_t dwModes,
                              int32_t& nFlags,
                              int32_t& nMasks) {
   nFlags = O_BINARY | O_LARGEFILE;
@@ -34,7 +34,7 @@ CFXCRT_FileAccess_Posix::~CFXCRT_FileAccess_Posix() {
   Close();
 }
 FX_BOOL CFXCRT_FileAccess_Posix::Open(const CFX_ByteStringC& fileName,
-                                      FX_DWORD dwMode) {
+                                      uint32_t dwMode) {
   if (m_nFD > -1) {
     return FALSE;
   }
@@ -44,7 +44,7 @@ FX_BOOL CFXCRT_FileAccess_Posix::Open(const CFX_ByteStringC& fileName,
   return m_nFD > -1;
 }
 FX_BOOL CFXCRT_FileAccess_Posix::Open(const CFX_WideStringC& fileName,
-                                      FX_DWORD dwMode) {
+                                      uint32_t dwMode) {
   return Open(FX_UTF8Encode(fileName), dwMode);
 }
 void CFXCRT_FileAccess_Posix::Close() {