Add wxPlatformInfo::GetCpuArchitectureName()

This provides the same information as wxGetCpuArchitectureName(), but is
consistent with the other wxPlatformInfo accessors, which also
correspond to the existing wxGetXXX() functions, and makes it more
convenient to use this information in the application code as now
everything is available via wxPlatformInfo instead of having to use
different functions for different pieces.

include/wx/platinfo.h

@@ -260,6 +260,8 @@ public:
         { return GetBitnessName(); }
     wxString GetEndiannessName() const
         { return GetEndiannessName(m_endian); }
+    wxString GetCpuArchitectureName() const
+        { return m_cpuArch; }
     wxString GetOperatingSystemDescription() const
         { return m_osDesc; }
     wxString GetDesktopEnvironment() const
@@ -301,6 +303,8 @@ public:
         { SetBitness(n); }
     void SetEndianness(wxEndianness n)
         { m_endian = n; }
+    void SetCpuArchitectureName(const wxString& cpuArch)
+        { m_cpuArch = cpuArch; }
 
     void SetDesktopEnvironment(const wxString& de)
         { m_desktopEnv = de; }
@@ -386,6 +390,9 @@ protected:
 
     // endianness of the machine
     wxEndianness m_endian;
+
+    // CPU architecture family name, possibly empty if unknown
+    wxString m_cpuArch;
 };