Use 32-bit timestamps for imported Eagle files

Fixes: lp:1754610
* https://bugs.launchpad.net/kicad/+bug/1754610

common/eagle_parser.cpp

@@ -258,20 +258,20 @@ NODE_MAP MapChildren( wxXmlNode* aCurrentNode )
 }
 
 
-unsigned long EagleTimeStamp( wxXmlNode* aTree )
+unsigned int EagleTimeStamp( wxXmlNode* aTree )
 {
     // in this case from a unique tree memory location
-    return (unsigned long)(void*) aTree;
+    return (unsigned int) reinterpret_cast<uintptr_t>( aTree );
 }
 
 
-time_t EagleModuleTstamp( const wxString& aName, const wxString& aValue, int aUnit )
+unsigned int EagleModuleTstamp( const wxString& aName, const wxString& aValue, int aUnit )
 {
     std::size_t h1 = std::hash<wxString>{}( aName );
     std::size_t h2 = std::hash<wxString>{}( aValue );
     std::size_t h3 = std::hash<int>{}( aUnit );
 
-    return h1 ^ (h2 << 1) ^ (h3 << 2);
+    return (unsigned int)( h1 ^ (h2 << 1) ^ (h3 << 2) );
 }
 
 

include/eagle_parser.h

@@ -364,13 +364,13 @@ public:
  */
 NODE_MAP MapChildren( wxXmlNode* aCurrentNode );
 
-/// Make a unique time stamp
-unsigned long EagleTimeStamp( wxXmlNode* aTree );
+///> Make a unique time stamp
+unsigned int EagleTimeStamp( wxXmlNode* aTree );
 
-/// Computes module timestamp basing on its name, value and unit
-time_t EagleModuleTstamp( const wxString& aName, const wxString& aValue, int aUnit );
+///> Computes module timestamp basing on its name, value and unit
+unsigned int EagleModuleTstamp( const wxString& aName, const wxString& aValue, int aUnit );
 
-/// Convert an Eagle curve end to a KiCad center for S_ARC
+///> Convert an Eagle curve end to a KiCad center for S_ARC
 wxPoint ConvertArcCenter( const wxPoint& aStart, const wxPoint& aEnd, double aAngle );
 
 // Pre-declare for typedefs