Fix build issues macOS and msys2

Added #if USE_DECLSPEC_PROPERTY condition to control use of
__declspec(property). The -fdeclspec now is not needed to compile using
clang.

Removed use of the IS_INTRESOURCE() macro to the inline method bool
IsIntResource() as the former depends on Windows.h.

thirdparty/3dxware_sdk/inc/SpaceMouse/CActionNode.hpp

@@ -201,7 +201,7 @@ public:
     base_type::next = next.release();
   }
 
-#if !defined(__GNUC__) || defined(__clang__)
+#if USE_DECLSPEC_PROPERTY
   /// <summary>
   /// The <see cref="SiActionNodeEx_t"/> properties.
   /// </summary>

thirdparty/3dxware_sdk/inc/SpaceMouse/CHitTest.hpp

@@ -44,7 +44,7 @@ public:
   CHitTest() : m_aperture(1), m_dirty(false), m_selectionOnly(false) {
   }
 
-#if !defined(__GNUC__) || defined(__clang__)
+#if USE_DECLSPEC_PROPERTY
   /// <summary>
   /// Property accessors
   /// </summary>

thirdparty/3dxware_sdk/inc/SpaceMouse/CImage.hpp

@@ -25,6 +25,7 @@
  */
 
 // stdlib
+#include <cstdint>
 #include <string>
 #include <sstream>
 
@@ -39,9 +40,22 @@
 #endif
 #endif
 
-#ifndef _WIN32
-#define IS_INTRESOURCE(x) false
+/// <summary>
+/// Determines whether a value is an integer identifier for a resource.
+/// </summary>
+/// <param name="id">
+/// The pointer to be tested whether it contains an integer resource identifier.
+/// </param>
+/// <returns>
+/// true when  id is an integer identifier for a resource, otherwise false when
+/// it is typically a pointer to a string </returns>
+__inline bool IsIntResource(const char *id) {
+#ifdef _WIN32
+  return ((reinterpret_cast<uintptr_t>(id)) >> 16) == 0;
+#else
+  return false;
 #endif
+}
 
 namespace TDx {
 /// <summary>
@@ -85,7 +99,7 @@ public:
     }
   }
 
-#if !defined(__GNUC__) || defined(__clang__)
+#if USE_DECLSPEC_PROPERTY
   /// <summary>
   /// Gets or sets the image id.
   /// </summary>
@@ -181,7 +195,7 @@ public:
 
     std::string r_id;
     if (resourceId != nullptr) {
-      if (IS_INTRESOURCE(resourceId)) {
+      if (IsIntResource(resourceId)) {
         std::ostringstream stream;
         stream << "#" << reinterpret_cast<uintptr_t>(resourceId);
         r_id = stream.str();
@@ -192,7 +206,7 @@ public:
 
     std::string r_type;
     if (resourceType != nullptr) {
-      if (IS_INTRESOURCE(resourceType)) {
+      if (IsIntResource(resourceType)) {
         std::ostringstream stream;
         stream << "#" << reinterpret_cast<uintptr_t>(resourceType);
         r_type = stream.str();

thirdparty/3dxware_sdk/inc/SpaceMouse/CNavigation3D.hpp

@@ -106,7 +106,7 @@ public:
   virtual ~CNavigation3D() {
   }
 
-#if !defined(__GNUC__) || defined(__clang__)
+#if USE_DECLSPEC_PROPERTY
   /// <summary>
   /// Gets or sets a value indicating whether the 3DMouse navigation is enabled.
   /// </summary>