Add wxGetCpuArchitectureName() for finding out CPU architecture

The returned value is OS-dependent and can be something
like: "x86_64", "x86", "arm64".

Closes https://github.com/wxWidgets/wxWidgets/pull/2121

include/wx/utils.h

@@ -153,6 +153,9 @@ WXDLLIMPEXP_BASE bool wxIsPlatformLittleEndian();
 // Get platform architecture
 WXDLLIMPEXP_BASE bool wxIsPlatform64Bit();
 
+// Get machine CPU architecture
+WXDLLIMPEXP_BASE wxString wxGetCpuArchitectureName();
+
 #ifdef __LINUX__
 // Get linux-distro information
 WXDLLIMPEXP_BASE wxLinuxDistributionInfo wxGetLinuxDistributionInfo();